avoid object creation
allow fine tuning of cold-start quality level and after-seek quality level

replace hls_startfromlowestlevel and hls_seekfromlowestlevel
by hls_startfromlevel and hls_seekfromlevel
these new customization keys are more flexible
related to https://github.com/mangui/HLSprovider/issues/183
fix https://github.com/mangui/HLSprovider/issues/194
Merge branch 'master' of https://github.com/mangui/HLSprovider
update swf/swc