Black Shark Graphics Engine

- found and removed a bug in build of a path;
- edited test of KD-tree - it was reduced 2d level displayed objects, otherwise they intersect scrollbars;
- gallery was updated.

I improved a little more:
- was improved mechanism releasing of textures - texture-singleton is released if it is not used already;
- 3d tests were changed - it was added reset of frustum orientation;