Renamed some functions

- Renamed Begin3dMode() --> BeginMode3D()
- Renamed Begin2dMode() --> BeginMode2D()
- Renamed End3dMode() --> EndMode3D()
- Renamed End2dMode() --> EndMode2D()

examples/models/models_box_collisions.c

@@ -87,7 +87,7 @@ int main()
 
             ClearBackground(RAYWHITE);
 
-            Begin3dMode(camera);
+            BeginMode3D(camera);
 
                 // Draw enemy-box
                 DrawCube(enemyBoxPos, enemyBoxSize.x, enemyBoxSize.y, enemyBoxSize.z, GRAY);
@@ -102,7 +102,7 @@ int main()
 
                 DrawGrid(10, 1.0f);        // Draw a grid
 
-            End3dMode();
+            EndMode3D();
             
             DrawText("Move player with cursors to collide", 220, 40, 20, GRAY);