Full rewrite of all CMakeLists

cmake/osxbundle/obs.icns

cmake/osxbundle/obslaunch.sh

deps/CMakeLists.txt

deps/jansson/CMakeLists.txt

deps/w32-pthreads/CMakeLists.txt

libobs-d3d11/CMakeLists.txt

libobs-d3d9/CMakeLists.txt

libobs-opengl/CMakeLists.txt

libobs/CMakeLists.txt

libobs/obs-cocoa.c

libobs/obs-nix.c

libobs/obs-windows.c

libobs/util/c99defs.h

libobs/util/platform-windows.c

obs/CMakeLists.txt

obs/platform-osx.mm

obs/platform-windows.cpp

obs/platform-x11.cpp

plugins/CMakeLists.txt

plugins/dshow/CMakeLists.txt