CMake: enable building and installing as a library #311
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This is far less ambitious than #13, but I hope it can be merged more easily as it doesn't reorganize files.
It also generate CMake export files, and a basisu::basisu_lib CMake target, which makes it easy to use basis_universal from other CMake projects
The build can use the ZSTD from the library when available, otherwise fallbacks to the embeded copy.
Tested on Linux (ubuntu 20.04) and Windows (MSVC 2019)