Add 3.5.2 and 3.8.2 support

[Eeems]

Initial work to add 3.5.2 support. This requires splitting the repo again to add rmallos3v5, rm1os3v5, and rm2os3v5 for 3.5.2 and newer support.

The new repos will use timower's version of rm2fb. This only adds 3.5.2 and 3.8.2 support.

[Eeems]

This will require testing all UI applications to make sure they work as expected. The new rm2fb uses a different mechanism to send messages between the server and client, which may have unintended consequences.

[Eeems]

This will also require testing of the kernel packages as well, due to the OS upgrade.

[Eeems]

remux suspend doesn't display the suspend image, and the power button doesn't do anything.

[MoritzBoehme]

Is this still supposed to land eventually? I was planning to give v3.8.2 a try today, but due to the most recent comment on #859 I am unsure if this would even make sense...

[MoritzBoehme]

If anything feel free to ping me when either this or future versions need testing :)
Would also be happy to help with packaging etc.

[Eeems]

Is this still supposed to land eventually? I was planning to give v3.8.2 a try today, but due to the most recent comment on #859 I am unsure if this would even make sense...

#859 (comment) is rather explicit about not continuing with 3.8 support.