Added 3 new icons for new/open/save to resources for the tablet apps

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23168 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Trying to show the splash screen only if it the canvas is big enough in web. Also increasing height according to toolbar/menubar existance.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23169 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Don't change height for the real application.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23170 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e