Legacy cleanup, part 2 (#3659)

* Legacy cleanup, part 2

There are still things that can be removed, those will be likely done in part three:
`The Return of the Cleanup` :)

Signed-off-by: nemerle <96597+nemerle@users.noreply.github.com>

* Fix windows build

Somehow there were some unfixed errors from enabled warnings?
I'm unsure if I've pulled repo in unstable state, or those were somehow
missed.

Signed-off-by: nemerle <96597+nemerle@users.noreply.github.com>

Code/Editor/Geometry/TriMesh.h

@@ -198,8 +198,6 @@ public:
     void GetStreamInfo(int stream, void*& pStream, int& nElementSize) const;
     int  GetStreamSize(int stream) const { return m_streamSize[stream]; };
 
-    void SetFromMesh(CMesh& mesh);
-    void UpdateIndexedMesh(IIndexedMesh* pIndexedMesh) const;
     // Calculate per face normal.
     void CalcFaceNormals();