core-4772 fix validations for list and tree
core-3956  fix tool saving issue
CORE-4614: Implemented a caching strategy for app metadata
CORE-4793: Reference selectors disabled in edit mode
Also corrected issue with app template property panel selecting and
flushing of deployed components
CORE-4790 Added MaxLengthValidator to label fields.

Added MaxLengthValidator to label fields in ArgumentPropertyEditor, except for Info Text properties.
CORE-4790: Prevent entry after 255 on all app argument field labels
CORE-4793: Non-functional change.
added fixme
Merge branch 'master' into STABLE