1. -Delete 2d camera in UISystem.cpp, use default camera in render group instead.
1. Add grid and camera in AnimationGLWindow.
1. -Rename polish.
1. -Remove DoRender and PostRender interfacce in RenderTarget.
2. -Remove SwapBuffers interface. All stuff will be done in Render function. (Don't care about the detail of render.)
1. -Move Render scene from CRenderManager to CRenderTarget. Because CRenderMananager is in common use, and Not all window need to render the scene.
1. -Fix a bug in EditorSceneWindow.
2. -Fix a compile warning in ChangeAIState.
1. -Improve AnimationGLWindow.
1. -Make viewport not a list, since I don't think it is necessary.
1. -Fix a spelling bug.
1. -Fix a bug about no-border font height in FreeTypeFontFace.
2. -Save the component font texture also.
1. -Improve component rendering pos.
1. -Fix a spelling mistake.