Fix several issues with 74xGxx symbols
- Scale symbols to be at least 400 mils tall (to better fit power pins)
- Do not hide power pins, and move them to top/bottom of symbol.
- Change all text sizes to 50 mil
- Prefer using inverted pin names instead of inverted pin styles where possible
- Add background color where it's easily possible
- Move pins onto the 100 mil grid
Some examples:
Edited by apo