Add support for GOG Oblivion, Specifically

[ThisNekoGuy]

• Name: Oblivion (GOG)
• Short name: oblivion

• Executable: Oblivion.exe (Version: 1.2.0.416)
• Launcher [optional]: OblivionLauncher.exe (Version: 1.0.0.1)
• Data path: Data
• Documents path: Documents\My Games\Oblivion\

• Steam ID [optional]: N/A -- (GOG Version of the game)

Provide additional details regarding the game that could be required for the plugin.
For example, when adding GOG versions of Skyrim as the target, MO2 warns about selecting the correct game version or else it supposedly "won't start the game correctly;" however, when setting up MO2 for GOG Oblivion, it (incorrectly) seems to be recognized as the Steam version of the game for some reason and doesn't set the two apart. To be sure this isn't possibly issue, I wanted to check here if there's something can be done about it (I'm not sure how this would normally affect Skyrim, for example, and how such a thing would possibly manifest in similar cases).