Code cleanup: moving poly/ into xenia/base/

src/xenia/base/README.md

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+A lightweight cross-platform/compiler compatibility library.
+
+This library presupposes C++11/14 support. As more compilers get C++14 it will
+assume that.
+
+Other parts of the project use this to avoid creating spaghetti linkage. Code
+specific to the emulator should be kept out, as not all of the projects that
+depend on this need it.
+
+Where possible, C++11/14 STL should be used instead of adding any code in here,
+and the code should be kept as small as possible (by reusing STL/etc). Third
+party dependencies should be kept to a minimum.
+
+Target compilers:
+* MSVC++ 2013+
+* Clang 3.4+
+* GCC 4.8+.
+
+Target platforms:
+* Windows 8+ (`_win.cc` suffix)
+* Mac OSX 10.9+ (`_mac.cc` suffix, falling back to `_posix.cc`)
+* Linux ? (`_posix.cc` suffix)
+
+Avoid the use of platform-specific #ifdefs and instead try to put all
+platform-specific code in the appropriately suffixed cc files.