IDE Preferences Editor

[lofcz]

A DarkToolWindow serving as a preferences editor for Simplex.

Functionality

• A mid-level API (append to SimplexIdeApi class) to easily add preferences as we will progress further
• Save / load preferences (loading must be done in either MainForm.Shown or Load event)
• Preferences for (this will be updated on demand):
  • Load icons for the resource tree?