This patch adds a new API which allow us to access light shadow settings from python. The new API can be used to write custom GLSL materials with shadows. Reviewers: brecht, kupoman, agoose77, panzergame, campbellbarton, moguri, hg1 Reviewed By: agoose77, panzergame, campbellbarton, moguri, hg1 Projects: #game_engine Differential Revision: https://developer.blender.org/D1690