This allows to move this choice sooner in the process, thus having all
the user key presses at first, then all the actual installation going
without any key presses needed anymore... (that is, unless you wanted
to install the bootloader on a removable device. Then it will prompt
you there!)
- Additional "cosmetic"/future-proof changes: Rename all instances
of "floppy" in the bootloader install variables to "RemovableDisk"
because it would be great to have this install choice later.
- Layout adjustments in the translated bootloader pages.
- Skip bootloader installation on upgrades. The idea here is that if
we were able to find a ReactOS installation to upgrade, this means
we were able to find a valid bootloader + boot entry.
See also PR #5633.
This logic may be slightly improved in the future to detect whether
the underlying bootloader is FreeLdr and if so, only update its files.
But this is for the future.