v1.6.1: sometimes not everything is in my control

What's new?

• @spitzeqc: added custom path support to the GUI.
  • SD card dependency is now fully removed.

Bug fix

• @Epicpkmn11: fixed unicode paths for bannertool.
  • Fixes #25
• Fixed an exception where converting images would write nowhere
  • Fixes #12

Known issues

• DSiWare is not supported, as GameTDB does not provide box art for them (of course they don't, they don't come in a box.)