GCBASIC Code

Updated 16f1579.dat to correct INT OSC frequency

More changes to GCGB Preferences window, both for GCGB and in standalone Preferences Editor:
- Increased width of window
- Removed unnecessary help buttons - tooltips display same information
- Reordered tabs, programmer list is now first
- Programmer list now scrolls automatically when dragging a programmer up or down in the list
- References to GCGB in tooltips hidden in standalone mode

Minor compiler change: added error message when Do or Loop has no condition after While/Until

Improvements to compiler's handling of Do errors:
- Missing Loop now generates an error message
- Invalid mode after Do or Loop now also produces an error message instead of failing silently.

Updated HEX only message - one line change

Small compiler improvements:
- More descriptive error message when subroutine is too large on chips with 2048 word pages.
- More descriptive error message when trying to append an integer to a string
- Improved handling of :

Fix for schmitt trigger issue in LCD.h

Preferences editing tool now has a cow icon

GCGB Preferences window is now resizable

Adding Nextion driver support