Refactor oslib, input & related platform specific interfaces

[skmp]

This is an overly board issue, and we need as much help as we can get.

The current platform-specific code is split all over the place, and needs to be cleaned up.

Some starting points

• java/jni interface is bad
• per-platform bootstrap code is not clean
• Setting loading could be better (also see: Move settings loading out of NullDC #820)
• OS_* function should be moved to oslib, and split into files / folders that do make sense
• OS_LINUX includes a ton of other things: Android, Freebsd (see Build on FreeBSD #1079), OSX, IOS, Emscripten. We need to figure out some nicer way to express this
• many more

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[skmp]

Poking @myfreeweb, do you want to tackle the OS_LINUX one... ?

[valpackett]

Yeah, maybe. Do you have a solution in mind? I think most of OS_LINUX should actually be the default code (#else), would that be fine?

[skmp]

I was thinking of doing a OS_UNIX and then introducing UNIX_FLAVOR == FLAVOR_ANDROID/BSD/LINUX/OSX/IOS to handle the *nix forks. How does that sound?

[valpackett]

Yeah, that's good

[AbandonedCart]

If you were cloning the hierarchy of android, the platform would be the variant and the flavor would be things like x86 / x64.

[skmp]

We already do have HOST_CPU=CPU_* for arch differentiation though.

[AbandonedCart]

There are a lot of ways to say the same thing and it seems like reicast uses all of them.