Complete rework

• Completely reworked libtesla's structure

  • libtesla's now a header-only library

• Added ability to read config values from sdmc:/config/tesla/config.ini

  • Currently only supports changing of the key combo

• Lots of bug fixes on the way

  • Fixed drawing of white space characters with drawString
  • Improved frame rate
  • Lots of fixes from the recent PRs by @diwo
  • Prevent focus glitchout when pressing the home or power button