add CCEither module

add CCList.chunks

add iter/seq functions to CCString

add CCList.reduce (resolves #305)

fix: in CCInt pick popcount at runtime on 64 bits

fix: in shims, use configurator properly to determine int size

in CCFormat, add append, append_l, infix ++ for sequencing, space, break, cut

fix: in CCSexp, handle non-ascii escapes in strings

CCUtf8_string: add and expose uchar_to_bytes

enable auto deploy of doc

improve CI: test core on non ubuntu platform, test all on ubuntu

update readme

CCImmutArray: add tests (#344)

add fuzzing (#339)

add stronger test to compare with uutf in ccutf8string