AA2Install v7 beta 2

Changelog since last stable:

• Installation now shows proper percentage progress
• Massive optimizations and speedups
• Completely reworked 7z handling
  • Console tab removed since no more use
• Experimental RLE compression to decrease size of output .pp files
• Now detects if mods are valid
  • Also checks if actual mod is inside 7z
• Rewritten preview loading
• Added modpacks
• Now checks for free space on required drives
• Added Vista/XP Compatibility mode
• Fixed a whole heap of bugs
• Added a plugin system
  • Comes with an experimental .PP content trimmer