classes instead of Video.

such as alpha blending, depth test, etc.

MeshViewer : Camera update and small object tweak.
             ortho to perspective transition is now perfect.

- removed 24 CR characters
 - removed 1 trailing whitespaces
 - replaced 63 tabs with spaces

optimisation flag -Os instead of -O3.

users will get all sorts of weird conflicts.

- removed 98 CR characters
 - removed 29 trailing whitespaces
 - replaced 2369 tabs with spaces

- removed 49 CR characters
 - removed 2 trailing whitespaces
 - replaced 1622 tabs with spaces