TextArea: don't reparent handles out of flickable

Change-Id: Ie119c3a725dd0fc451fba83e390e2cbc93685cf3
TextArea: don't hide handles when there is a selection

Always show the handles when there is a selection, and hide them
otherwise. No need for extra calculation logic that currently has
bugs since we don't take into account the reparenting.

Change-Id: I2147824629c321096ebadf6252e41a88766dc527
Add new private control 'EditMenu'

This control will be used as a part of the different
text edit controls for controlling how the edit menu
should work.

Change-Id: Id3ed5795111c37269fce62a97cf4d9bde1b5f6b3
Add EditMenu to input controls

Add EditMenu to TextArea, TextField, ComboBox and
SpinBox.

Change-Id: Ic2fed55c467dde65334006d252f4052430f3f40c
update example

Change-Id: Id7abcc298e7b5586f0b328f431feae3ee7015698