ams: support building unit test programs on windows/linux/macos

ams: update build system to add generic-fallback support

libstratosphere: use from /atmosphere/libraries

Improve exception wrapping

Results: Implement namespaced, type-safe results. ...

Because I was working on multiple things at once, this commit also:
- Adds wrappers for/linker flags to wrap CXX exceptions to make them
  abort. This saves ~0x8000 of memory in every system module.
- Broadly replaces lines of the pattern if (cond) { return ResultX; }
  with R_UNLESS(!cond, ResultX());.
- Reworks the R_TRY_CATCH macros (and the result macros in general).

sm: add HasService/HasMitm, refactor into sts::

sm: adjust Makefile

stratosphere: more result cleanup

Merge branch 'bis_protect'

sm: Disable smhax, it interferes with functionality.

Add defines for atmosphere git revision.

Stratosphere: Fix FS permissions for <4.0.0 KIPs

atmosphere: extract API version management to common folder

sm: add compile-time option to put a lower bound on session limits, which lets us do things like accessing fsp-ldr without killing ldr. (#136) ...

This time with style fixes.

SM: Make Mitm compile-time toggleable, to forestall whining.

loader, pm, sm: build kip as only taget (thanks @fincs !)

SM: Add compile-time smhax flag, finishing module. (Closes #62)

Stratosphere: Skeleton all services for sm.