#821 Statistic of used surfaces, walls, area, objects

[Tester7]

SH could calculate and sum up the most important values, and present them in a statistic dialog text field. In this way a user must not calculate all wales and window/door holes of a plan, and can quick calculate a approximate of materials (bricks, cement, main objects etc) and costs.

For example:
Surface of the base area.
Surface of the walls, separated by there thickness. (minus all holes)
Inside surface of all rooms.
List of all objects, specially fix/wall objects like windows, doors, switches etc
(Rooms 3D volume, but maybe not most important)