Minor changes.

- Replaced default template parameter for profiling_point with typedefs for types of timers.
- Corrected typo in perf_vis scaffold drawing.
Working torwards being able to display text in game.

- Added Rambla font files
- Added sprite_text_system which currently only initializes SDL_ttf.
- Changed entity::create_component, now using perfect forwarding so that a default constructor
  is not required for components.
Added placeholder textures for each object currently in the game.