Show osu!(lazer) in windows "default apps" menus

[Susko3]

• Depends on Clean up windows association manager code #31450
• Needs to be refactored to read more like Clean up windows association manager code #31450.
• Alternative to / closes Allow users to explicitly choose whether to set up file associations #30473
  • file and URI associations are always installed, but (with some osu! stable code changes) the user can choose between stable and lazer in all the usual places

Implementation

Very simple, just sets the registry keys as defined in https://learn.microsoft.com/en-us/windows/win32/shell/default-programs. You can read the commits for more details. The specific keys/concepts used are: RegisteredApplications, Capabilities, ApplicationDescription, FileAssociations and UrlAssociations.
Previously, the default URI handler and file type handlers were set to osu!(lazer) when it was installed. This has now been removed. We trust that the windows explorer / shell will provide a sane default (works as expected from my testing).

End goal for the UX

Important: this doesn't work yet with this PR, changes to osu!(stable) are needed to get this working. Lazer will continue to steal association from stable at the moment.

osu! and osu!(lazer) appear in the "Open with" context menu

The user can choose default apps for each file type / URI in the Settings app

The user is presented with the "Select an app..." after installing osu!(lazer)

In this example, osu!(stable) was first installed, an .osk file was opened in stable, and then osu!(lazer) was installed and the .osk file double-clicked.

Same applies when opening an osu:// URI.

If the user never opened a file type in osu!(stable), both options are presented equally when lazer is installed.

[peppy]

No major issues with the code here. I'll setup the stable portion of this change and test before merging.