Ticket #3823: implementing "create" in the web spreadsheet context menu

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30192 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Fix for #3846

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30193 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#2225: Fix for slider double click (show slider tab)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30194 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#3861: Increased size of OpenFromGGT dialog to fit size of new page design

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30196 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e