Improve the support for exploring deprecated GT classes

[chisandrei]

[refactoringdr]

Here's a script to return them in order of date deprecated.

| repo |
((SystemNavigation default allImplementorsOf: #isDeprecated)
	collect: [ :each | 
		([ repo := IceRepository registeredRepositoryIncludingPackage: each package.
		log := IceLibgitTonelLog for: repo.
		(log historyOfMethod: each) first datetime ] onErrorDo: [ :ex | nil ])
			-> each printString ]
	thenSelect: [ :each | each key notNil ]) asSortedCollection

[chisandrei]

Current support: