Choose SIMD implementation at cmake time #161
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A less drastic version of #157 (this doesn't delete proxy files or change folder structure). A motivating factor behind deleting the proxy files was to prevent multiple files having the same name so that ninja/vcpkg/Xcode would not complain, although this doesn't seem to be an issue anymore with the changes I've made.
This PR merges both the OGRE_SIMD_SSE2 and OGRE_SIMD_NEON flags into a single flag OGRE_SIMD, and CMake is now responsible for picking SSE2, NEON or C.