Changed the keywords to reflect the change of taking out templates.

This commit also deletes other keywords that will not be used like
"inline" and "immutable". I decided that the keyword "inline" would
only do something that the compiler should do based on the optimization
level. The "immutable" will be replaced by "const". In my original rough
design, LFyre would have had two different meanings of "immutable" and
"const", like the D language, but I don't think that's necessary.