Weapons built from traits, fashion, Hourglass, About tab, and Ithaca

- Every attack is now assembled from traits on its definition instead
  of per-weapon code: an anchor and path (thrusts, out-and-back, arcs),
  shared flight physics (gravity, drag, acceleration, homing, and one
  wall response: end, burst, stick, crawl, bounce, stop, pass, return,
  latch), and flags like bouncy, drifting, tethered, orbiting, instant
  and arming. Melee are projectiles too.
- Shots have a lifetime and a fade (when damage bottoms out). Range is
  speed times lifetime. Ricochets and the Vacuum wind lifetime back.
- The Vacuum pulls anyone's shots, and its airblast flips them out
  along the aim, claiming enemies' (fading into your colour).
- New trinket: Hourglass, longer projectile lifetime and range. Ropes
  and chains lengthen with it and the Accelerator.
- Fashion: 23 items worn on the head, face or torso, chosen in Profile.
- Flamethrower flames hit continuously, the whip coils and sweeps,
  bouncing shots roll over ramps, and Ricochet relights grenade fuses.
- Profile tab, colour tooltips, option hints on every setting, an
  About tab with credits and links, and the Ithaca font.
- Loadouts lock once readied, tomatoes clear with the match, and the
  round-over pause is 4 seconds.
- CC0 license. Tools and CLAUDE.md are no longer tracked, and the web
  shell moves to web/.

src/chat.cpp

@@ -83,10 +83,30 @@ void Chat::clear()
 void Chat::players_clear()
 {
     bubbles.clear();
+    pvps.clear();
     typing.clear();
     recent.clear();
 }
 
+// In a lobby's sandbox, tells everyone whenever a player turns PvP on or off, in their colour. Someone just arrived
+// is only noted.
+void Chat::pvps_announce(Game& game)
+{
+    if (!game.session.isJoined || game.sim.match.state != MATCH_PRACTICE)
+        return;
+    for (int i = 0; i < game.sim.fighterCount; i++)
+    {
+        int owner = game.sim.match.owners[i];
+        bool isPvp = game.sim.fighters[i].isPvp;
+        auto known = pvps.find(owner);
+        bool isChanged = known != pvps.end() && known->second != isPvp;
+        pvps[owner] = isPvp;
+        if (isChanged)
+            system(game.session.name_get(game, owner) + (isPvp ? " turned PvP on." : " turned PvP off."),
+                   game.color_get(i, TINT_PLAIN));
+    }
+}
+
 // Who a fighter's chat belongs to: its lobby member online; offline, this screen's own fighter is the one that talks
 // (under this screen's member id, -1).
 int Chat::member_get(Game& game, int fighter)
@@ -96,9 +116,9 @@ int Chat::member_get(Game& game, int fighter)
     return fighter == game.local ? game.net.selfId : NO_MEMBER;
 }
 
-void Chat::system(const std::string& text)
+void Chat::system(const std::string& text, Color color)
 {
-    lines.push_back({.text = text, .color = WHITE, .time = seconds_get()});
+    lines.push_back({.text = text, .color = color, .time = seconds_get()});
     if ((int)lines.size() > CHAT_LINES_MAX)
         lines.erase(lines.begin());
 }
@@ -118,7 +138,7 @@ void Chat::say(Game& game, int member, const std::string& text)
 
     bool isOnline = game.session.isActive;
     int fighter = isOnline ? game.session.fighter_get(game, member) : game.local;
-    Color color = fighter >= 0 ? game.color_get(fighter, true) : WHITE;
+    Color color = fighter >= 0 ? game.color_get(fighter, TINT_PLAIN) : WHITE;
     std::string name = isOnline ? game.session.name_get(game, member) : std::string(game.settings.name);
     lines.push_back({.text = name + ": " + text, .color = color, .time = now});
     if ((int)lines.size() > CHAT_LINES_MAX)
@@ -135,6 +155,7 @@ void Chat::update(Game& game)
     for (std::string& notice : game.net.notices)
         system(notice);
     game.net.notices.clear();
+    pvps_announce(game);
     Input& input = game.input;
     if (!isOpen && !game.menu.isOpen && input.is_key_control_pressed(CONTROL_CHAT))
         open(game);
@@ -219,7 +240,7 @@ static std::vector<std::string> arguments_split(const std::string& text)
     return words;
 }
 
-// /name <name> and /color <colour> change this player's (as Customize does), /kick "<name>" "<reason>" (the host
+// /name <name> and /color <colour> change this player's (as Profile does), /kick "<name>" "<reason>" (the host
 // only) puts a player out of the lobby, and /help lists them. Answers are system lines only this player sees.
 void Chat::command(Game& game, const std::string& text)
 {
@@ -248,7 +269,9 @@ void Chat::command(Game& game, const std::string& text)
         // Sent through this screen's controls like the menu's toggle, so every machine sees it on the same tick.
         bool isPvp = !game.local_get().isPvp;
         game.input.edit_send(game.devices[game.local], edit_encode({.type = EDIT_PVP, .value = isPvp}));
-        return system(isPvp ? "PvP is now on." : "PvP is now off.");
+        if (!game.session.isActive)
+            system(isPvp ? "PvP is now on." : "PvP is now off.");
+        return;
     }
     if (name == "/kick")
     {
@@ -360,9 +383,9 @@ void Chat::overhead_draw(Game& game)
         int member = member_get(game, i);
         if (!fighter.isAlive || member == NO_MEMBER)
             continue;
-        Color color = game.color_get(i, true);
+        Color color = game.color_get(i, TINT_PLAIN);
         float centerX = fighter.body.box.x + fighter.body.box.w / 2;
-        float y = fighter.body.box.y - above;
+        float y = game.scene.top_get(fighter) - above;
         bool isTyping = member == game.net.selfId ? isOpen : typing[member];
         if (isTyping)
         {