fatal: Implement the first half of StopSoundTask

fatal: SleepThread takes ns, not ticks

fatal: Implement BacklightControlTask

fatal: Implement AdjustClockTask

fatal: Implement PowerControlTask

fatal: misc cleanup, verified to reboot on hardware

fatal: Add missing bpcInitialize() call.

fatal: Implement PowerButtonObserveTask

fatal: Implement StateTransitionStopTask

fatal: Write ErrorReportTask

fatal: Skeleton tasks, write ThrowFatalImpl.

fatal: Implement fatal:p, fatal:u stub.

Bump version to 0.7.4

fs.mitm/loader: Fix crashes when launching too many processes.

pm: Only register privileged processes with FS as needed

Add current branch to make dist zip name

Make libstratosphere a submodule

Delete libstratosphere in prep for submodule

pm: Use non-system event for process tracking.

libstratosphere: add ReadOnlySystemEvent helper

libstratosphere: Add thread primitive, WaitableManager->RequestStop()

libstratosphere: Implement message queues

libstrat: Use iterators when looping deferred waitables

libstrat: Significantly cleanup waitable manager result handling.

libstrat: fix potential oob deref in WaitableManager (closes #256)

libstrat: improve waitable manager cancelsync semantics

libstrat: update curthreadhandle for libnx 1.5.0

libstratosphere: Use intraprocess event signaling for new waitable management

libstrat: Allow nullptr buffers if 0 size. (closes #255)

fs.mitm: Cache IStorageInterfaces, store meta on SD instead of memory.