Currently when you add plat.add_resources(plat.break_off_pmod) there is a build error

NameError: Trying to add (resource user_led 0 (pins o pmod_2:7) (attrs IO_STANDARD=SB_LVCMOS33)), but (resource user_led 0 (pins-n o 11) (attrs IO_STANDA
RD=SB_LVCMOS33)) has the same name and number

It is caused by overlapping resource indices in icebreaker.py board description.
In order to address this issue numeration has changed to be contiguous.
For example, user_led on main board have indices 0 and 1 and PMOD user_led are now assigned to numbers from 2 to 6. Similar adjustments are made to user_ledr, user_ledg and user_btn