CAS speedup part 1: speeds normal things up, but breaks CAS

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@28113 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Using FileDialog instead of JFileChooser in sandboxed Mac: datafile and imagefile loading implemented (step 2)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@28114 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Removed dead code

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@28115 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Update stuff after CAS is loaded asynchronously

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@28117 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e