On demand loading of google APIs

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@28465 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
* Trying to fix giac problems with gbasis (seems successful)
* Using very first version of Botana's method with giac ("cheating")


git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@28466 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Ticket #3485: some 5 KB of improvement and the consciousness that WebSimple doesn't use GuiManagerW and LayoutW, etc.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@28467 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e