Track texture mapping
Fix track mapping and sphere particle position
Flare textures should work now
Ground spot texture drawing
Transparent plant textures
ComputeSphereVisibility and fixes in CEngine TODOs

- view frustum culling with ComputeSphereVisibility - game should run
  faster now
- resolved/removed most TODOs from CEngine
- fixed OpenGL tests
Main loop enhancement

Frame updates were posted one frame behind in event queue
Performance counters
Fixed syntax error in Blender script
Static objects using OpenGL VBOs and display lists
Emit info message for GTest source.
Use system GMock and GTest if they are available

- Drop library addition to upstream GTest.
- Fallback to convenience copy if the system libraries are not installed.
Merge pull request #88 from OdyX/dev-graphics-system-gtools

Use system-provided Google tools in dev-graphics
Revert "Merge pull request #88 from OdyX/dev-graphics-system-gtools"

This reverts commit f5b4705cad6c7071a24912b81987a488a8cef0f7, reversing
changes made to 4811defca2eeea69e40346be6b1647f276db8c76.
Engine optimization - rewritten model management

 - new class CModelManager
 - rewritten engine object structure in CEngine
 - created shared model data instead of separate objects per each
   model instance
 - minor refactoring
Minor cmake grammar fix

It is redundant to have CMAKE_INSTALL_PREFIX in path definitions; drop them.

Re-do a7d837460f5eeba060900031322d088ba330964c
Merge pull request #103 from OdyX/dev-desktop-file

Add desktop and icon files
Merge pull request #104 from OdyX/dev-minor-cmake-grammaer-fix

Minor cmake grammar fix
Merge branch 'dev' into dev-desktop-file-man
Always build manpages

solves #105