in the editor show the context menu by clicking the right mouse button or by pressing the context key on the keyboard

git-svn-id: svn://svn.code.sf.net/p/vpinball/code/trunk@629 14438d79-0ffd-4333-8ae7-ea2bdd901387
wrap all material related stuff

git-svn-id: svn://svn.code.sf.net/p/vpinball/code/trunk@630 14438d79-0ffd-4333-8ae7-ea2bdd901387
PinImage class is now Texture. Some material bugs fixed

git-svn-id: svn://svn.code.sf.net/p/vpinball/code/trunk@631 14438d79-0ffd-4333-8ae7-ea2bdd901387