Add information about the functions of the pins.o

[yrabbit]

Includes information on additional pin functions such as RPLL_C_IN, GCLKC_3, SCLK and others. This allows a decision to be made about special network routing of such pins

Signed-off-by: YRabbit rabbit@yrabbit.cyou

[yrabbit]

Unfortunately the version of the chip base is changing and this will entail an interesting process of friendship with nextpnr.

[pepijndevos]

So the plan is to merge this, do a beta release, do a nextpnr PR right?

[pepijndevos]

Trying to remember if the nextpnr failure is expected. I think yes right, because it should crash on the version check.

[pepijndevos]

ERROR: Incorrect chipdb version 2 is used. Version 1 is required yea