fixes/improvements to rules 6.3, 6.6 and 10.3 + commandline-options --addsilkscreenrect and --rotate

Created by: jkriege2

• rule 10.3: now also replaces ';' as separator
• rule 10.5: now adds a user-text '%R' on F/B.Fab so the REFDES is visible on F.Fab AND F.SilkS (see new KLC)
• rule 6.6:
  • now --fix will add a rectangular courtyard with 0.2mm offset to the pads and F.Fab (or F.SilkS if F.Fab does not exist) and if no CrtYd exists so far
  • now this rule can --fix a too-large/too-small courtyard rectangle. If the courtyard contains no rectangle with vertical7horizontal lines only it is not checked/altered (e.g. for packages with round courtyards, or advanced shapes)
• rule 6.3 now does not crash if pin1 does not exist + it tries to find A1 if 1 was not found + it now also moves the 3D model
• added rule 1.8, which checks for UNIX-style line-endings + kicad_mod-files are now explicitly saved with UNIX-style line-endings
• added a commandline-option --addsilkscreenrect that simply adds a silkscreen rectangle around what's found in the footprint (F.Fab, pads, ...)
• added a commandline-option --rotate degrees that rotates the full footprint by a given number of degrees (clock-wise), also rotates the 3D model correctly!