* Consolidate the measure tool into one tool (this gives cvpcb
unit changing and snapping capabilities in its measure tool)
* Transition cvpcb to use actions for the sketch modes
* Replumb how magnetic items settings are stored and used
CHANGED: Settings are now stored in versioned sub-directories
ADDED: First-run dialog for migrating settings from a previous version
CHANGED: Settings are now stored as JSON files instead of wxConfig-style INI files
CHANGED: Color settings are now all stored in a separate settings file
CHANGED: The symbol editor and footprint editor now have their own settings files
CHANGED: Color settings are no longer exposed through BOARD object
CHANGED: Page layout editor now uses Eeschema's color scheme
Settings are now managed through a central SETTINGS_MANAGER held by PGM_BASE.
Existing settings will be migrated from the wxConfig format on first run of each application.
Per-application settings are now stored in one class for each application.
Ian McInerney
jean-pierre charras
Jeff Young
Jon Evans