Logging is not consistent

CMDHELPER-3163 - Reported by PseudoKnight

We need to do a pass over the logging in CH to make it more consistent and work on various platforms correctly. (some platforms show [CommandHelper] twice in some locations, other times not at all) This means we need to use the plugin logger if available, and make it accessible from a singular location like Static. I propose Static.getLogger(). I'm not sure how CHLog would fit into this, though, as that seems to be more for warnings/errors. Maybe it should be adapted instead? We need to figure out what we want before fixing this.