Common: Correctly set ptr to null if mmap fails in memory_util

Removed redundant loop in EmuThread::run()

Replace insecure temporary file creation with devshm.

Common: Move header guards over to pragma once.

Core: Fix undefined behavior in mem_map_funcs' WriteBlock function

Core: Fix a formatting error in svc.cpp

entry_point would not be added to the string. Also used StringFromFormat
so that the buffer is unnecessary.

On POSIX systems mmap will return MAP_FAILED ((void*)-1) instead of a null pointer.

Also replaced C headers with the C++ equivalent ones

Bootmanager: changed `filename` to std::string

Simplified if-tree in extended_trace.cpp

Use glewExperimental to fix crashes with citra-glfw

float24: Remove private default constructor

Fixes building with clang.

Hid minor improvements

HID: Fix typo with DisableGyroscopeLow command.

Changed iterators to use auto, many of which using range-based loops

Initial work on Pica rendering.

24-bit floating points are used internally for calculations on the GPU, however the current code will still emulate that with 32-bit floating points.
In the future we might want to accurately perform the calculations with correct bitness in the future, but for now we just wrap the calculations around this class.

I wrote most of this for ppsspp, so I hold full copyright over it.
In addition to the original release in ppsspp, this provides functionality to easily extend e.g. two-dimensional vectors to three-dimensional vectors.

This cleans up the mess that address reading/writing had become and makes the code a *lot* more sensible.
This adds a physical<->virtual address converter to mem_map.h. For further accuracy, we will want to properly extend this to support a wider range of address regions. For now, this makes simply homebrew applications work in a good manner though.

GSP: Fix a major regression introduced in ffda035c, due to which no display transfers were triggered at all anymore.

Remove the fancy RegisterSet class introduced in 4c2bff61.