Merge review/1845: PR #1845 DGNIMPORT with fixes

# Conflicts:
#	src/app/commands/dgn_import.rs

src/app/commands/mod.rs

@@ -860,6 +860,7 @@ inventory::submit!(crate::command::CommandRegistration {
         "SELECTIONCYCLING",
         "UCSDETECT",
         "SURFACEASSOCIATIVITY",
+        "DGNIMPORTMODE",
         "LAYOUTCREATEVIEWPORT",
         "TXT2MTXTCOMBINEMTEXT",
         "TXT2MTXTTEXTORDER",