Add and fix copyright notices for better GPL compliance (thanks @naehrwert and @CTCaer).

Modernize C++ usage (#144) ...

* Stratosphere: Use modern C++ idioms in some places

* algorithms like std::for_each are used instead of raw loops

* Stratosphere: Replace more raw loops with algorithms

* Stratosphere: Add a utility predicate function to test for equality with a reference element

This can be used to rewrite some common raw loops using algorithms instead

* fs.mitm: Use variant

* fs.mitm: Use enum class

* fs.mitm: Turn RomFSSourceInfo::Cleanup into a destructor

This obsoletes the need for a custom deleter in other places

* fs.mitm: Use enum class some more

* fs.mitm: Use unique_ptr

* fs.mitm: Simplify initialization

* Stratosphere: Simplify initialization

* fs.mitm: Use unique_ptr (fix memory leak along the way)

The previous code was using "delete" rather than "delete[]"

* fs.mitm: Use vector::emplace_back rather than push_back

emplace_back constructs elements in-place, hence avoiding a redundant element copy.

* Stratosphere: Replace more raw loops with algorithms

* Stratosphere: Use unique_ptr

* fs.mitm: Replace more raw loops with algorithms

* Stratosphere: Prefer move-construction over copy-construction when moving sink parameters around

fs.mitm: WIP LayeredFS impl (NOTE: UNUSABLE ATM) ...

Also greatly refactors libstratosphere, and does a lot of other things.
There is a lot of code in this one.

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.

fs.mitm: Implement basic passthrough framework for input commands.

SM: Add IPC commands for first-class MITM installation.

SM: Match official SAC validation behavior.

SM: Fix svcGetSystemInfo bug, now works on 5.0.2.

Stratosphère: Simplify some for loops (#76) ...

Simplifies some loops by removing the need to manually calculate or
re-specify the array size. Eliminates any chance of using the
wrong size and less typing.

SM: After checking docs, kernelAbove400() -> kernelAbove500()

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

Stratosphere: Fix remaining bugs in sm, which now works as a KIP1 on hardware

Stratosphere: Fix IServer constructors. SM is fully functional on hardware now.

Stratosphere: Implement support for deferred commands. Finish sm GetService()'s deferred path.

Stratosphere: Create sm:m internally for sm, instead of using IPC.

Implement all of sm.