tests: switch to rexo

misc: C99 is required

misc: added signature for changeset 6750b0276186

misc: added tag 2.0.0 for changeset e4a6c3f3d0f2

misc: minor typos and changes 2.0.0

man: add libbase64.3 manual page

misc: general cleanups

base64: fix invalid compute on binary data

base64: use more ints

base64: use more idiomatic comparison

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