TISTUD-5662 Windows: Font size
  - Modify the font sizes for tabs to be different on each OS. 14 on Mac, 11 on Windows, 12 on Linux. Use Segoe UI font on Windows, PT Sans on Mac, don't specify font on Linux.
try to fix up theme issues from the fix for Windows font issue
TISTUD-5504 Bumped up the version number of p2 director plugin to override the bundled plugin.