This introduces a very hacky way of telling TranslateFilePath that a path is already native and doesn't need translating. I don't like this very much, but addressing this in any other way is very much outside of the scope of this PR.
* Add setup step to grant `MANAGE_EXTERNAL_STORAGE`
* WIP re-implementation of Android `Rename` using native filesystem manipulation
* Applied clang-format and updated license headers
* Support user directories on removable storage devices
* If `MANAGE_EXTERNAL_STORAGE` is lost, re-request it
* Fix missing permission dialog appearing during initial setup
* Added empty code branches to prep for old Android support
* Fixed permission setup completion not accounting for external storage permission
* Implement code for Android <11
* Fixed emulation error if a renamed file is then opened for R/W
* Detect if the current user directory cannot be located, and prompt re-selection
* If an invalid user directory is selected, reject and re-prompt
