Add a version of ArmarXGuiPlugin::addWidget not instantiating GuiPlugins (if they implement GetWidgetName)

No managed ice object create

See merge request !48

The EnhancedTreeWidget supports some additional functions compared to the QTreeWidget:
- pixel wise scrolling is fixed
- it can be set to auto expand (it will have the size of all visible children)

The EnhancedTreeWidget supports some additional functions compared to the QTreeWidget:
- pixel wise scrolling is fixed
- it can be set to auto expand (it will have the size of all visible children)

add more parameters to WidgetDescription::makeXYZRollPitchYawWidget (custom bounds) and provide a convenience function

Fix duplicated proxz entries for statecharts

See merge request !47

will optimise the transmission of value changed signals (they are send to the root widget directly and not along the tree)

fix some more warnings

remove compiler warnings
apply astyle autoformatting

* 'master' of https://gitlab.com/ArmarX/ArmarXGui:
  add trash icon

add a widget that can be used to display variants/ vectors of variants/ maps of …

See merge request !46

add a blank icon

See merge request !45

add a way to describe a widget layout via ice and a widget using this description to create the described widget layout

add a widget that can be used to display variants/ vectors of variants/ maps of variants in a gui and is able to update its content to display a new set of variants (vor each class of variant data a factory is required)
add factories for most variant data classes from armarx core (container are missing)

add icons for black/gray triangle pointing up/down/left/right