ref #81 fixed colorId vertex shader, changed to version 150 core
ref #81 added id to sceneHierarchyTree

put node selection into extra function
ref #81 clicking on an item in the sceneHierarchyTree node causes selection and highlighting of the item
ref #81 enablend single deselection (with right click)
ref #81 connected sceneHierarchyTree highlighting properly with Node highlighting
ref #81 Set whole sceneHierarchyTree expanded when loading file
Merge branch 'picking_and_highlighting' of github.com:cgcostume/cgsee into picking_and_highlighting