Create editable inspectors

[hernanmd]

This issue is related to #635.
Try to create a StInspectorEditCommand

StInspectorCommand << #StInspectorEditCommand
	slots: {};
	tag: 'Command';
	package: 'NewTools-Inspector'

with the following execute method:

execute 

	self context rawInspectorPageOrNil	 
		ifNotNil: [ : page | 
			| pageView pageViewColumns |
			pageView := page retrievePresenter view.
			pageViewColumns := pageView attributeTable columns.
			pageViewColumns
				detect: [ : c | c evaluation = #stringValue ] 
				ifFound: [ : col | col beEditable ].
			pageView update ]

then edit the following method and open a Transcript:

SpStringTableColumn>>#initialize 

	super initialize.
	'no editable' traceCr.
	editable := false.
	sortable := false

If you open an inspector and click the new Edit button in the top-right:

Dictionary new
	at: 1 put: 'hola';
	at: 2 put: 'bonjour';
	yourself.

After making some clicks, it seems the inspector constantly recreates the Spec table, so any beEditable is useless.

Maybe we should have edit instead of inspect?