use AppD.loadTextFile to load shaders

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37283 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
SetSpinSpeed command

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37284 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Distance[ point, plane ]

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37285 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e