update: add some files to .gitignore.

Signed-off-by: Kim Kulling <kim.kulling@googlemail.com>
bugfix: fix compiler warning: converting double to float.

Signed-off-by: Kim Kulling <kim.kulling@googlemail.com>
bugfix:
- remove and comment some gcc compiler warnings for not used vaiables.
[FBX] fix default light intensity to 100
Add intensity field in light structure and separate from diffuse etc (do not premultipiy )
add CastShadows field for aiLight
add Range field in Lights