#3842: MultipleOptionsModel and common/simplified CheckGeos(..) for all models using abstract methods isValidAt(index), apply(index) for BooleaneOptionsModel and MultipleOptionsModel and getValueAt(index) for BooleanOptionsModel. Descendants have to override these methods only in most cases.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30151 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Ticket #3174: the newer fix has made an earlier fix obsolete and invalid

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30152 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Ticket #3174: reset icon put into a better place initially

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30153 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Ticket #3174: removing the default outline action in Chrome on focus

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30154 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e