Enhance, ENHANCE...

Few cool new features and bunch of fixes.

Notable commits:

• 3534d6a Double click checkbox column to set/unset all
• 748dd39 Make checkbox columns sortable
• 582cc4e Render text using KiCad native newstroke font
• f034663 Make bom columns sortable
• db9089f Allow project root to be used as plugin base folder
• 90e3293 Add shortcut 'n' to tick "Placed" checkbox and highlight next row
• 3be7469 Remove unnecessary canvas redraws in mouse handlers
• 828904e Fix reverse lookup when board is rotated
• 45a9e78 Implement board rotation
• 5630121 Add option to highlight pin 1
• 6ac220d Fix compatibility with kicad 4
• 05c75be Take pad offset into account