support Z80next

.tzx: modify sanity test for code size in PURE DATA block

.hex and .s19: skip over gaps inside segments

tzx: fix error in segment length check

check shift value for operator << and >>

outputfile.cpp: fix checkZX80File() and checkZX81File()

improve path conversion for cygwin (turbocat2001)

fix directory separator for cygwin

bumped version

Doku on changes to "macro"