Refactor out utility supporting functions to Signup.util.
Convert all indents to tabs as that's what is mainly used.
Add some JavaDoc about applyTo and memberApplyTo.
WL-2921 Don't display join wait list for non-bookable courses.

This changes our logic so we now look at any course and if it's bookable display the signup button independent of where it came from.
Trimmed trailing space. Convert space to tabs.

Also removed whitespace only lines.