[giac] tidying interfaces

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@24938 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Ticket #3065: commiting parts of the patch to see what works and what doesn't

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@24939 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
HTML5: shift needed for wheel zoom
Java: remove Ctrl for wheel zoom (also zooms browser page)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@24940 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e