Add tool for extracting XSTR calls #1740
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This uses clangs LibTooling for parsing the FSO source files to ASTs
which can then be used for extracing the strings used in XSTR calls.
This supports both standard XSTR calls and UI_XSTR definitions and
writes the resulting information in the strings.tbl format to stdout.
It also detects duplicate translation id usages with different text
values.
The tool is entirely optional and is automatically disabled if the clang
development libraries could not be found by CMake. I only tested this
on Linux so other platforms may encounter problems.