Qt: patch creator

[Megamouse]

Adds a new dialog "Utilities -> Patch Creator".
The dialog is basically a big input form that can be used to create a valid patch in yml format.

Features:

• Input fields for the usual keys that need to be added to a patch (one game only for now)
• Editable instruction table for easy patch creation. Uses dropdowns for instruction type.
  Instruction table controls:
  Rightclick: context menu with a couple of actions (including the following)
  Del: Delete Selection
  Ctrl+Up/Down: Move Selection (if contiguous)
• Patch file export (Ctrl+E)
• Patch validation on the fly
• yml preview on the fly
• Splitter to resize both sides to your liking

Future ideas:

• Validators for the offset and value fields depending on the chosen type
• Stricter yml validation (Game version or Title-ID for example)
• Patch and/or instruction import
• Caching of the last window/patch states in some QSettings file
• Support for alias (this one is a bit more tricky, so keep your expectations low)

The thing is still very basic, so no hard feelings if it sucks mkay?