* Update ACT_U
* Create act_a.h
* Create act_a.cpp
* Add service ACT:A
* Add ACT:A source and header
* Fix wrong header

Reserve enough space in the vector that holds the linear heap memory to prevent relocations of the backing memory when growing too much.

Closes #1790

HLE/Applets: Give each applet its own block of heap memory, and use that when creating the framebuffer shared memory block.

Kernel: Account for automatically-allocated shared memories in the amount of used linear heap memory.

APT: Move the shared font loading and relocation functions to their own subdirectory services/apt/bcfnt.

Applications can request the kernel to allocate a piece of the linear heap for them when creating a shared memory object.
Shared memory areas are now properly mapped into the target processes when calling svcMapMemoryBlock.

Removed the APT Shared Font hack as it is no longer needed.

R0 is used as the last parameter instead of R4.

The other mode was system mode.

We do not currently implement any cores other than the AppCore (Core 0).

Kernel/Threads: Dynamically allocate the TLS region for threads in the BASE region of the linear heap.

Each thread gets a 0x200-byte area from the 0x1000-sized page, when all 8 thread slots in a single page are used up, the kernel allocates a new page to hold another 8 entries.

This is consistent with what the real kernel does.

HLE/Applets: Use the correct size for the framebuffer SharedMemory in the swkbd and MiiSelector applets.

This has been entirely superseded by MicroProfile. The rest of the code
can go when a simpler frametime/FPS meter is added to the GUI.