OCSADV-170 OCSADV-172 OCSADV-175: Updated error messages and fixed bug where guiding feedback wasn't being updated when RA and Dec were changed through TargetEnvironment editor text fields.
OCSADV-172: Case class and method name cleanup.
OCSADV-29: Removed no longer used event handling code I added earlier.
OCSADV-29: Made recommended Scala change.
Merge pull request #80 from sraaphorst/feature/OCSADV-29

OCSADV-29: Improved AGS warnings / errors and fixed bug about no guiding feedback update when positions modified in Target Editor.