Simplification.
Updated ENet to 1.3.9.
nullptr.
Renamed headers to .hpp for syntax highlighting.
Cleaned up vertex pool allocation.
Added TrueType typeface support.
Removed last use of Singleton.
Updated GLM to 0.9.4.6.
Used C++11 deletion for non-copyable types.
Enabled image-less texture creation.
Added key modifiers.