Fixed cppclassgen template.
Added tilemap_component files.
Renamed vertices from use to contents. Added pos2 vertex.

- Forgot to actually add tilemap component files.
Factored out common functionality from tilemap and sprite into renderable_array (for now).
Starting tileset implementation.

- Adding fatal errors to resource exception constructors for now.
Accidentally have been working on master branch. Compiles and runs.
Merge branch 'master' into hack
Updated LE_FATAL_ERROR* to use cppformat.