Changing method openKeywordFile to loadKeywordFileIntoLLSD to load cached/default syntax file and method to access sKeyWordsXML.

loadKeywordFileIntoLLSD was taken almost verbatim from LLKeywords::loadIntoLLSD which can be removed later.
I know the name is long but I wanted to remember where it came from and why it is how it is.
Removed a little cruft also.