remove Symbola, add GgbRoboto(Slab) (Apache 2.0)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@29325 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
remove Symbola, add GgbRoboto(Slab) (Apache 2.0)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@29326 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
remove Symbola, add GgbRoboto(Slab) (Apache 2.0)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@29327 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Removing references of Symbola from MathQuill

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@29328 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#3691: ReflectAngleModel and it is applied for desktop.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@29329 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
properties error

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@29330 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#3013 continued.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@29331 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e