Roblox now installs to /Roblox/Player/ instead of /Versions/<version guid>
This is a checkpoint commit. No mod manager, no error checking, no fullscreen optimizations configuration. Only installing and launching Roblox.
THIS WORKED FIRST TRY BY THE WAY
Automatic updater now relies on the -upgrade flag specifically being set and uses a mutex for coordinating the process
Temp directory is now obtained appropriately (should fix exceptions relating to it?)
Installation details are now reconfigured on every upgrade
Specifying a nonexistant flag would insta-crash the app
Also, the message box was making the wrong sound for the warning icon
