To allow to select the filter of the texture

[perefm]

To allow to select the filter of the texture. Specs

• if no option is defined, then use LINEAR as default
• TextureManager: When loading a texture with the same name but different filter type, a new texture should be allocated

[perefm]

Now texture properties are able to be used, since v.1.16.0, but:

• Not implemented for FBO's or Cubemaps... should we?
• textureManager: not yet implemented --> When loading a texture with the same name but different filter type, a new texture should be allocated