Debugger: Remove unused values from DebuggerStartMode

Change-Id: I84ec3dea504e51bb925c925564aa9b5c84133fbf
Reviewed-by: hjk <hjk121@nokiamail.com>
Utils: Add a base for tree like models

That kind of boiler plate comes up often enough to justify a wrapper.

Change-Id: I94aa5b1ccbe5a98f091a47087654e59e9e122c1d
Reviewed-by: Tobias Hunger <tobias.hunger@theqtcompany.com>
Kit: Rename m_displayName to m_unexpandedDisplayName

That's what it is.

Change-Id: Ibd19203b30a98eb2b4b57039a8d619c031d2e5e2
Reviewed-by: Tobias Hunger <tobias.hunger@theqtcompany.com>