Debugger: More column resizing

Turns out setting the column resize mode on the view itself
is counter-productive as it takes away the ability to
manually re-adjust.

So set the mode only temporarily to get the preferred width
than switch back to manually resize mode and use the hint
to set some initial size. Also use the length of the header
label as absolute minimum.

Change-Id: Ic17e31334b23ce6d541f9459cd22be65145046d3
Reviewed-by: Eike Ziller <eike.ziller@digia.com>
Debugger/Utils: Merge Debugger::TreeView into layer above and below

Change-Id: Ibb186cabba8fecedfdbd04da000459cf358e56e4
Reviewed-by: Eike Ziller <eike.ziller@digia.com>
Debugger: Consolidate Debugger view creation

Change-Id: I43353911c7c0c8250ee2bccddcf5fdccf04d457c
Reviewed-by: hjk <hjk121@nokiamail.com>
Find: Add a convenience "factory" for searchable treeview wrappers

Change-Id: I19890dd13d597ca71c134db7b036fa1ade0d5b5a
Reviewed-by: Eike Ziller <eike.ziller@digia.com>