Fix various operand edit issues.
Temp state
Remove unneeded class.
Don't lose literals.
Don't reset adapter everytime the expression changes.
Display operand values in operand variable display.
Keep speechmarks around string literals when getting value.
Add variable clearing on long press.
Add test method which returns a string.
Change object filter to use ored operand types rather than special lookup.
Filter methods using ored operand types.
Add a little documentation.
Add i18n for parameter names in prop methods.
Use stub operands for unset parameters.

Also, use parameter names.
Don't save invalid call value when editing operand as a call.
Ignore long click on header in listener.
Update operand type when selecting method for call value.
Correctly select tab for edit operand dialogue.
Format call operand properly in operand view binder.
Load call value parameter operands in edit call value fragment.