DVE: Add message binding

In connection/device properties dialog add a tab/table (one per connection).

All connections from IVE are listed where the function names do match. One checkbox per IVE connection to bind/unbind.

• Add DVMessage entity to dvecore
• Save/load DVMessages
• Add table(s)/tab to device/connection properties dialog
• Fill table with IVE queried data
• command to bind/unbind messages