Cleanup _lp_source_config: remove _lp_ prefix from locals
Cleanup _lp_source_config: remove _lp_ prefix from locals

Now that color definition utilities (_lp_ti_*) variables and functions
are "local" we do not fear to override someting defined by the user.
So just rename to shorter and cleaner names without the _lp_ prefix.

joshuarubin/dotfiles,lyoshenka/liquidprompt,colinlieberman/liquidprompt,alexprengere/liquidprompt,jaesivsm/liquidprompt,dan-cleinmark/liquidprompt,pkkolos/liquidprompt,smadhueagle/liquidprompt,elementalvoid/liquidprompt,joshuarubin/dotfiles,milouse/liquidprompt,enrdstrm/liquidprompt,laurentbardin/liquidprompt,tsbarnes/liquidprompt,dpilone/liquidprompt,timhyson/liquidprompt,tkuminecz/liquidprompt,nojhan/liquidprompt,dtschan/liquidprompt,tstone2077/liquidprompt,joshuarubin/dotfiles,jonathanjsimon/liquidprompt,mathieumd/liquidprompt,tocomo/liquidprompt,illwieckz/liquidprompt,joshuarubin/dotfiles,BobHood/liquidprompt,kenrachynski/liquidprompt