Switch to cmake and remove autoconf/automake

[fancycode]

          Maybe we should get rid of autoconf / automake and only use cmake, to avoid having to re-implement everything twice.

Originally posted by @fancycode in https://github.com/strukturag/libde265/issues/439#issuecomment-1881315326

[kmilos]

Is it 1:1 for features though? E.g. last time I checked sherlock265 was missing from CMake recipe?

[fancycode]

Well, anything that's missing in cmake should then be added before closing this issue and removing autoconf/automake ;-)

[farindk]

Duplicate of #356.