[REBUILD] Allow disabling the confirm navigation popup
Improved "prevent navigation" alert by tracking field changes instead of using flawed isDirty() check.

The FormPanel.isDirty() check does a raw comparison between the original value and the current value of each of the fields. When using a rich text editor, there could be changes in the current content value of a resource due to changes in formatting (editors forcing a <p> root block) or encoding (& being turned into &amp;) which would result in the navigation popup. While yes, there are changes, no, the user did not make them so they should not be bothered with a popup.

The commit changes from looking at FormPanel.isDirty() to tracking field changes through the changeField event and a local flag.

This commit also resolves an issue where changing templates would show the warning during the reload.
Oops, put lexicon back in order.
Seriously... I think I need coffee
Do not trigger confirmation dialog when the empty cache checkbox was triggered
Affects CacheMaster users.
Bump version for 2.2.12 dev
Updated copyright dates
Improve Confirm Navigation feature and make configurable

Merge remote-tracking branch 'origin/pr/820' into release-2.2

* origin/pr/820:
  Do not trigger confirmation dialog when the empty cache checkbox was triggered Affects CacheMaster users.
  Seriously... I think I need coffee
  Oops, put lexicon back in order.
  Improved "prevent navigation" alert by tracking field changes instead of using flawed isDirty() check.
  [REBUILD] Allow disabling the confirm navigation popup