Added clang-format config

[invokr]

Config taken from the dolphin emulator project. See this file as an example of how formated source code would look like: https://github.com/dolphin-emu/dolphin/blob/master/Source/Core/Core/ActionReplay.cpp

I don't mind any specific style as long as it is consistent so I hope someone else will chip in and modify the sections they need. Important points might be such things as column with (cur 100) or ident width (cur 2).

I would run this over all source files and do another pull requests if there is a consensus.

[nitrocaster]

Just in case if you haven't yet seen the conventions we use: https://github.com/OpenXRay/xray-16/wiki/Cpp-Coding-Conventions

[invokr]

I didn't actually know about that, I only saw the old guidelines in text form. I'll update the format config to incorporate as many of the guidelines as possible

[CrossVR]

Are we sure we want to base it on the Dolphin code style? Shouldn't we use the LLVM style as a base? clang-format -style=llvm -dump-config > .clang-format

[CrossVR]

Meh, using dolphin as the base is fine by me, let's just run this thing and get it over with.