Release 1.3 - uniform optimization

Changes in 1.3

#2 shader_get_uniform needs to be called only once - this reference does not change.
Remove from the draw method and make the uniform handles instance variables on the outline_drawer struct class.

#3 Sometimes, when rotation is involved, the outline has breaks and shows pixels from behind the object.

Release 1.2 - HTML5 rotation fix

Fixes a bug with rotating sprites in HTML5 target

Release 1.1.0 - HTML5

This update makes the shader usable on the HTML5 target too.

Release 1.0

Initial release of the shader drawer