Use pre-defined coordinates for scheduler GUI drawing

There are methods to obtain the relative coordinates for latency, execution time and io ports.

https://gitlab.liu.se/da/B-ASIC/-/blob/master/b_asic/operation.py#L941 and onwards

added Scheduling GUI label

marked this issue as blocking #115

marked this issue as related to #103

mentioned in merge request !107 (merged)

mentioned in merge request !108 (merged)

closed with merge request !108 (merged)

mentioned in commit 689208f9