Revert "Inherit DialogAdapter from MvxAdapterWithChangedEvent/MvxAdapter so events are attached and views are bindable"

This reverts commit be5b461d646cc11a5d73b887444928949b45f377.

Did not really need it anyway in the end :-)
Made it a little safer.
Some strange stuff is happening if you create your own layout for a dialogactivity, but this does fix that
Made precision configurable and the event methods overrideable