Performance optimizations and collision improvements

Performance:
- Remove expensive inverse() from all vertex shaders (terrain, WMO, M2, water, character)
- Add uniform location caching to avoid repeated glGetUniformLocation calls
- Add proper frustum culling for WMO groups using AABB intersection
- Add distance-based culling for WMO and M2 instances
- Add cleanup of unused M2/WMO models when tiles unload

Collision & Movement:
- Add M2 doodad collision detection (fences, boxes, etc.)
- Reduce character eye height (5.0 -> 1.8) and collision radius (2.5 -> 0.5)
- Enable WoW-style movement speed by default (14 units/sec run, 5 walk, 9 back)
- Fix emote grammar ("You waves." -> "You wave.")

Misc:
- Rename window title to "Wowee"

src/core/application.cpp

@@ -51,10 +51,10 @@ bool Application::initialize() {
 
     // Create window
     WindowConfig windowConfig;
-    windowConfig.title = "Wowser - World of Warcraft Client";
-    windowConfig.width = 1920;
-    windowConfig.height = 1080;
-    windowConfig.vsync = true;
+    windowConfig.title = "Wowee";
+    windowConfig.width = 1280;
+    windowConfig.height = 720;
+    windowConfig.vsync = false;
 
     window = std::make_unique<Window>(windowConfig);
     if (!window->initialize()) {