Configurable Profile Path in Loader

[BinToss]

Allow setting the profile data path ("-path") to a sub-directory of the game folder whether for convenient accessibility, portability, or some other niche reason.
When profile data migration is available, ask the user if they want to migrate profiles to their custom path.

Potential problems:

1. Program Files (x86). Why in God's name would anyone want to install there? It's too restrictive for Halo CE's intended operations (e.g. init.txt) which were decided before the invention of Windows' UAC permissions.
2. That would mean scrapping the %appdata% solution unless this is an optional feature (portable SPV3/HCE support?).
3. If the user can specify a path after creating a profile, then profile migration would be a prerequisite to avoid complaints of "deleted" profiles. Keep in mind that a user may not want to migrate data if that data is corrupted.