Closes #2400

Kernel: Removed the priority boost code for starved threads.

Kernel: Remove some unused functions.

After hwtesting and reverse engineering the kernel, it was found that the CTROS scheduler performs no priority boosting for threads like this, although some other forms of scheduling priority-starved threads might take place.

For example, it was found that hardware interrupts might cause low-priority threads to run if the CPU is preempted in the middle of an SVC handler that deschedules the current (high priority) thread before scheduling it again.

Kernel: Mutex priority inheritance and synchronization improvements.

This fixes a potential bug where threads would not get removed from said list if they awoke after waiting with WaitSynchronizationN with wait_all = false

Kernel: Remove Thread::wait_objects_index and use wait_objects to hold all the objects that a thread is waiting on.

Change travis to deploy on push to citra-nightly. 

Change deploy to use github releases instead

Kernel: Use different thread statuses when a thread calls WaitSynchronization1 and  WaitSynchronizationN with wait_all = true.

This commit removes the overly general THREADSTATUS_WAIT_SYNCH and replaces it with two more granular statuses:

THREADSTATUS_WAIT_SYNCH_ANY when a thread waits on objects via WaitSynchronization1 or WaitSynchronizationN with wait_all = false.

THREADSTATUS_WAIT_SYNCH_ALL when a thread waits on objects via WaitSynchronizationN with wait_all = true.

Kernel/Mutex: Propagate thread priority changes to other threads inheriting the priority via mutexes

The implementation is based on reverse engineering of the 3DS's kernel.

A mutex holder's priority will be temporarily boosted to the best priority among any threads that want to acquire any of its held mutexes.
When the holder releases the mutex, it's priority will be boosted to the best priority among the threads that want to acquire any of its remaining held mutexes.

This will be useful when implementing mutex priority inheritance.

Not all syscalls should cause reschedules, this commit attempts to remedy that, however, it still does not cover all cases.

Try a different travis key

Service/NFC: stub GetTagInRangeEvent

Try a different encrypted bintray api key for travis.

Try a different encrypted bintray api key for travis. Change appveyor to upload to a long git hash (since travis is stuck uploading to the full hash name)

Add deploy to bintray for builds to master

config: SDL: Move background color setting to correct section.

Fix Fatal Error in Mini-Mario & Friends - amiibo Challenge

Config: auto-select region and language

Lighting LUT Quickfix

Core: remove unused hle.cpp

Core: reset cpu_core in Shutdown to make IsPoweredOn work properly