Second beta

Bunch of improvements and fixes. Notable ones:

• b79f6b7 Add reference lookup field
• ad8969c F/FB/B buttons switch bom tables too
• 9cbef3f Improve default sorting order
• 86fd6e0 Embed pcb data into html
• 9fdb807 Use file name if title is empty
• b1abda6 Fix incorrect text scaling when it is rotated
• 7a05c9a Add better fallback fonts in pcb rendering
• 4dbfa24 Fix browser launching for all platforms