material manager - fixed crash when checkbox is checked
save material - using temporary files and textures with relative paths to the material
raw texture format
terrain height is computed in a vertex shader
terrain lod - WIP
terrain lod - working prototype - very ugly coded
minor improvements
terrain rendering refactored
16bit opengl textures; light_dir is sent to the terrain shader
terrain xz scale
proper terrain LODs when a terrain is scaled
terrain - y scale; scale is saved
memorytracker output fixed
merged master
update according to review
Merge pull request #245 from nem0/terrain_lod

Terrain lod
typo
Merge pull request #244 from nem0/material_manager

Material manager
navigation speed can be set
toggle wifreame in editor