Major code refactor.
MCU now loaded early so that info can be known of it.
Use wxSimAVR (and hence simavr) to provide list of supported cores instead of separate configuration file.
mcu.cfg no longer requred.
Adds indication (textual and bargraph) of memory usage (SRAM not yet implemented).
Add indication of EEPROM size.
Close app with warning if config not read sufficiently.
Don't wait for thread to end nicely - it closes later.
Temporarily added debug code to "About" showing some MCU (core) details.
Disabled firmare and code loading - need to review how best to handle file loading.
Removed const prefix to wxString function arguments - was keeping reference const not the string, resulting in original value being changed - exact opposite to intended.
Removed (unused) code intended to add context menu to profile menus - can't trigger menu from menu!