tests: replace doctest with googletest

ericwa / ericw-tools

Quake/Hexen 2 Map compiling tools - branch of http://disenchant.net/utils

http://ericwa.github.io/ericw-tools

GNU General Public License v2.0

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Closed ericwa closed 1 week ago

ericwa commented 1 week ago

googletest command-line output lists a nice summary of failed tests at the end, doctest's doesn't
string test case names in doctest make IDE file structure view useless
googletest has VS support
doctest development stalled

other changes:

get rid of doctest::skip(), all tests run now. (was only applied to 3 tests: "winding", "mountain", "base1")