minor optimizations

	modified:   lib/Text/ZPL.pm
minor optimization

	modified:   lib/Text/ZPL.pm
re-inline trim funcs

	modified:   lib/Text/ZPL.pm
commentary

	modified:   lib/Text/ZPL.pm
add Text::ZPL::Stream oo streaming decoder
Merge branch 'stream-api'

* stream-api:
  add Text::ZPL::Stream oo streaming decoder