Rename context menu entry "View Class" to "Open Class"

[Dietmar Winkler]

The current menu entry "View Class" does actually open the class in its original location. In order to avoid confusion especially if later perhaps a hierarchy browse-like function is added it should be renamed to what it actually does. I.e., "Open Class". This change should be made ASAP so that people don't get too used to the misleading "View Class" ;-)

_{PS: I'm aware of similarity to Dymola but you could say that it makes switching tools easier and also I could really not think of a better name that describes exactly what it does.}

_{PPS: I did not provide a PR this time since I think simply changing the string to "Open Class" when the handler still is called viewClass might lead to even more confusion on the code side. So better leave that refactoring to the professionals.}

[Adeel Asghar]

Done in 5f95f7e/OMEdit.

[Martin Sjölund]

Milestone renamed

[Martin Sjölund]

Milestone renamed