Conditionals for disabling smoothing & texture filtering

[modjke]

So now you can turn off smoothing / anti-aliasing / filtering (sets it to nearest) individually for each platform. -D flambe_webgl_force_nearest -D flambe_stage3d_force_nearest -D flambe_canvas_disable_smoothing

Take into account that with -D flambe_webgl_force_nearest flambe will ignore -D flambe_webgl_enable_mipmapping -D flambe_webgl_enable_linear

[Jorjon]

This looks great!