Use the citra user path for the sdmc directory
chunk_file: General cleanup

- Remove unnecessary ifdefs
- Remove commented out code. Can be retrieved later if needed.
Merge pull request #116 from archshift/sdmc-dir

Use the citra user path for the sdmc directory
Merge pull request #118 from lioncash/chunk-file

chunk_file: General cleanup
Added framework for configuration files system

Uses SimpleIni, which was added to externals.
Added default INIs, hooked in with keymaps
Use QSettings for Qt, further abstracting of settings in core/settings

Added copyright headers to new files.