reset text positions for all footprints

I have moved footprints with box select and this is prone to
accidentally selecting some text of another part. Therefore, we
reset all of them.

- update all footprints from library
  - all footprints
  - Update/reset text sizes, styles and positions
- use this to clean up the old and new .kicad_pcb and compare them:
  sed  's/(tstamp [-0-9a-f]*)/(tstamp xx)/; /layer "\(F.SilkS\|F.Fab\)"/ { s/(\(start\|end\|at\) [-0-9. ]*)/(\1 ..)/g }'