upgrade track.info to new format

[maliberty]

Prompt

The current OL uses new_tracks.py to convert tracks.info to the new style. The tracks.info format is insufficient for asap7 as the x_offset != y_offset and it only has a single offset.

Proposal

Remove new_tracks.py and tracks.info and replace it with a tracks.tcl. This should be a one time conversion cost.

[maliberty]

I see I misunderstood the format as it is possible to have X & Y separately specified. However it would still be good to convert to allow tcl expressions when needed (eg 1X vs 4X in asap7). Its not a blocker.

[donn]

The format is in open_pdks. https://github.com/RTimothyEdwards/open_pdks/blob/master/sky130/openlane/sky130_fd_sc_hd/tracks.info