Expose `confirmationText` and `cancelText` in HLModalWidget
Fixes HLMethodsListWidget >> reselectItem:
Renames button label accessors in HLModalWidget
Fixes HLClassesListWidget >> renderItem:level:on: to force reactivation
of the class on click
Adds a css class to helios widgets
removes DoIt >> foo
Fixes #563
better background color for helios debugger header
Makes helios overlays transparent
faster transitions for modal windows
solid background for helios key binding helper
fixes #868
fixes #600
Fixes #539
helios tabs: do not append the tabs for each refresh
Avoids having several warnings in a row about unsaved changes
Fixes #881:

- Adds Announcer >> on:do:for:
- Adds associated tests
Fixes mutliple confirm dialog when cancelling changes
rename callback function parameter to `amber`

... in comment example at the beginning of file
Fixes #893

- Adds PackageHandler >> commitPackage:onSuccess:onError:
- Adds Environment >> commitPackage:onSuccess:onError:
- Adds PackageCommitError class
- Adds HLPackageCommitErrorHelper to help the user in case the package
- commits fails.
- Improves HLRequestWidget to also work with inputs instead of textareas