New items are created using pointers (instead of copying automatic variables when drawing is finished).

Changed PCB_EDIT_FRAME::setTopLayer() to PCB_EDIT_FRAME::SetTopLayer() and changed to public (as it had exactly the same functionality).

Removed redundant fields DIMENSION::m_arrowD1O, m_arrowD2O, m_arrowG1O, m_arrowG2O (==m_crossBarO/F).
Added DIMENSION::SetOrigin(), DIMENSION::SetEnd(), DIMENSION::GetOrigin(), DIMENSION::GetEnd(), DIMENSION::GetHeight().
Fixed flipping for DIMENSION class.
Added an information that helps to understand roles of the points in the DIMENSION class.
Some minor changes to PCB_PAINTER (mainly using const COLOR4D& for taking the result of GetColor() function).

Drawing tool reacts to rotate & flip events while placing a text.

Removed an unnecessary header from class_board_item.h.