Upgrade TextMarker IDE to DLTK 3.0

The IDE is currently still based on 1.0 and therefore the TextMarker IDE relys on the older developer update site for the 1.0 version. The TextMarker IDE should be built upon DLTK versions that are shipped with the current Eclipse release. On the one hand, the TextMarker IDE can be installed without adding additional (old) update sites and, on the other hand, new features and support for new functionality in DLTK 3.0 can be integrated in the TextMarker IDE.