Limit maximum number of bones to 24 per model node

Vanilla cap seems to be 18 bones per model node. We would only need more
if we decide to add support for other model formats which I don't see as
likely.

src/engine/graphics/shader/shaders_common.cpp

@@ -48,7 +48,7 @@ const int FEATURE_FOG = 0x20000;
 const int FEATURE_DANGLYMESH = 0x40000;
 
 const int NUM_CUBE_FACES = 6;
-const int MAX_BONES = 128;
+const int MAX_BONES = 24;
 const int MAX_LIGHTS = 8;
 const int MAX_PARTICLES = 64;
 const int MAX_CHARS = 128;

src/engine/graphics/types.h

@@ -26,7 +26,7 @@ constexpr int kNumCubeFaces = 6;
 constexpr float kDefaultClipPlaneNear = 0.1f;
 constexpr float kDefaultClipPlaneFar = 10000.0f;
 
-constexpr int kMaxBones = 128;
+constexpr int kMaxBones = 24;
 constexpr int kMaxLights = 8;
 constexpr int kMaxParticles = 64;
 constexpr int kMaxCharacters = 128;