unhide all elements while saving and hide them afterwards

git-svn-id: svn://svn.code.sf.net/p/vpinball/code/trunk@584 14438d79-0ffd-4333-8ae7-ea2bdd901387
moved hide/unhide all options under Draw In Front/Back and use proper DoContextMenu() in PinTable.cpp

git-svn-id: svn://svn.code.sf.net/p/vpinball/code/trunk@585 14438d79-0ffd-4333-8ae7-ea2bdd901387
unhide all option shows all elements in the previous drawing order

git-svn-id: svn://svn.code.sf.net/p/vpinball/code/trunk@586 14438d79-0ffd-4333-8ae7-ea2bdd901387