ZenGL 0.2.3

One more bugfix release before releasing 0.3-dev branch

Changelog:
- [MacOS X]fixed start in fullscreen mode(dockbar didn't hide)
- fixed Y-offset in tex_Draw for new lines
- fixed memory leak in ogg loading function
- proper values for mouse_DX/mouse_DY when CORRCT_RESOLUTION is used
- fixed particles creation for EMITTER_TYPE_LINE
- added EMITTER_TYPE_RING
- fixed EMITTER_TYPE_CIRCLE
- now zgl_Get( RESOLUTION_LIST ) works before zgl_Init

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