Remove no longer used SQP CSS rules
Drop no longer used config for SQP CSS
Update CodeMirror to 3.15
Replace getCssCodeMirror by inline CSS
Drop no longer used $cfg['SQP']['fmtColor']
Drop $cfg['SQP']['fmtType']

It has no effect anyway and in case we would want to make syntax
highlighting optional, it needs to be done in javascript and needs
better configuration name than this one.