Boards cputype

[ffissore]

this patch improves the boards menu by adding custom, boards.txt driven menus

custom menus are defined at the top of the file

menu.cpu=Processor

i.e.:

menu.MENU_ID=label

When a board comes in different setups, you can group the common properties using the old syntax, for example

atmegang.name=Arduino NG or older

atmegang.upload.tool=avrdude
atmegang.upload.protocol=arduino

and then split the different params into different groups

menu.cpu.atmegang.atmega168=ATmega168
menu.cpu.atmegang.atmega168.upload.maximum_size=14336

menu.cpu.atmegang.atmega8=ATmega8
menu.cpu.atmegang.atmega8.upload.maximum_size=7168

i.e.:

menu.MENU_ID.BOARD_ID.GROUP_ID=label of the group for this board
menu.MENU_ID.BOARD_ID.GROUP_ID.parameters=parameter value

New syntax is compatible with the previous, so old, custom boards.txt will keep on working as usual