small imgui extension
scene palette shader crashfix

- removed 0 CR characters
 - removed 7 trailing whitespaces
 - replaced 332 tabs with spaces

Reworked Primitive logic for scene rendering
FileUpdateTester works now .....

MeshViewer first pass

SDL2: Mouse is back ! With correct focus support
SDL2: Added typing support with keyboard
ShaderBuilder: Refactored and simplified Shader block creation
Several warning removal
Fixed Image::Copy

Added Texture (by image) update in TextureImage (and tileset)
Added lolimgui first integration pass