[MULTI] MESSUI 0.144

Here are the changes that have been done so far:

• Better support for sysinfo.dat and messinfo.dat - the dialog to load these files now has the correct filenames as default.
• Removed Source Properties and Vector Properties options from game-context menu (when you right-click on a system name).
• Removed Samples folder from Directories dropdown.
• Removed HLSL tab. You can turn HLSL on from the Advanced tab. (see note* below)
• Fixed the problem where you could not select software from the pick-list.
• Fixed problem where the currently-loaded software wasn't highlighted in the pick-list.
• Fixed problem where the name of the software in the Device View was corrupted.
• Slight speedup of loading data into the software picker.
• The following are not supported and have been removed or deprecated:
  • sourcefile.ini
  • horizont.ini
  • vertical.ini
  • vector.ini
  • parent.ini
  • grandparent.ini
  • HLSL
  • Random Background
  • Samples
  • Broadcast
  • Mandatory cartslots

What still needs doing (if possible):

• If more than one software is loaded, to make them all highlighted instead of one of them.
• Enable to fill more than one slot from the pick-list.
• Enable to unload one slot by using the pick-list.
• Fix problem where all software is unloaded when you choose something from the pick-list.
• If first-time run of a system, inherit file paths from its parent instead of from mess.ini.

* Currently HLSL crashes the system after you exit the emulation. It is hoped the cause can be tracked down soon.