GCBASIC Code

Very minor GCGB change: Made it easier to click on and select a programmer in the Preferences dialog

Minor changes to GCGB source to allow re-use in Programmer Editor. Should be no changes to GCGB behaviour

New tool: Programmer Editor. This is based on code from GCGB and allows easy editing of programmer settings.

GCGB improvements:
- Programmer/Tool Editor window tidied up. Clearer layout, and a description of the various settings is now provided at the bottom of the window
- Added tick box to Preferences > Compiler tab to treat warnings as errors

GCGB programmer selection improvements:
- Can now choose which programmers are preferred (drag and drop to reorder, or move between preferred and other programmers list)
- Can now edit UseIf setting for programmers
- Compile and Download With menu now makes the used programmer the most preferred one.
- Also fixed a GCGB bug, += and -= operations were being corrupted.

Compiler change: Added error message for when a subroutine and a variable have the same name

Minor compiler fix: use SP rather than SPL on some smaller AVR devices

Added SSD1331 library

Added Microchip RTCC library for PIC

Compiler improvements:
- Added ShowProgressCounters option - add to [gcbasic] section of ini file and set to n to remove percentage complete display in verbose mode
- Compiler now returns exit code. Exit code will be 0xdeadbeef if errors found during compilation, exit code from programmer if programmer was run, or 0 otherwise.
- Compiler will now call appropriate programmer automatically. Add a UseIf = line to the [tool] section, specify multiple programmers in the programmer = line in the [gcbasic] section, and the first programmer with a value useif condition will be chosen.