Eruption Engine v0.7.2

Added:
-Runtime accessible shadows settings (resolution, bits)
-Dynamic example scene
-Shadowcasters sorting by distance (only the closest lights cast shadows)
-Separate shadow pipeline

Changed:
-angleDiff in Shaders/Lighting.frag is now clamped to outerCutoff in order to remove an unnecessary 'if' statement.
-Pipeline::CreateInfo now takes file paths (std::string) to shaders instead of pointers to existing shaders.