CAS context menu styling (#3531)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@28282 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Save image.png rather than image..png in files (not critical)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@28283 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#3503 fixed spreadsheet not editable if scaled. Splitter next.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@28284 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
CAS context menu will be removed, when user clicks beside. (#3531)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@28285 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#3164 refactor/improvement - local variables, nested functions/commands are colored

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@28286 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e