avoid creating useless string objects when parsing encrypted playlists
TS parsing: keep parsing PAT until PMT is found
save one boolean, and might improve playback of broken TS
optimize playlist parsing
loop once instead of 3 times
dont use regexp but line length to discard blank-line (blank line terminated with CR/LF length is 1)
related to https://github.com/mangui/HLSprovider/issues/212

Conflicts:
	src/org/mangui/HLS/parsing/Manifest.as