Fix licensing info so reuse lint passes; ignore some files.
#410
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Remove unused license LICENSES/Zlib.txt.
Fix typo in file name LICENSES/BSD-3-Clause.txt.
Convert license info from deprecated .reuse/dep5 to REUSE.toml.
Ignore
CMakeUserPresets.json, build files in build and output binaries in bin.These fixes been separated from PR #408. The changes are non-controversial and can be quickly merged. The reuse fixes are needed by the KTX-Software build.