[Linked fields] Add Linked Field as a custom field type (#1963)

* Proof of concept for Linked custom field type

* Linked Fields for all cipher types, use dropdown

* Fix linked icon alignment

* Tweak linked icon alignment and style

* Move add-edit custom fields to own component

* Disable copy for linked field

* Use Field.LinkedId to store linked field info

src/background/main.background.ts

@@ -271,7 +271,7 @@ export default class MainBackground {
                     const message = Object.assign({}, { command: subscriber }, arg);
                     that.runtimeBackground.processMessage(message, that, null);
                 }
-            }(), this.vaultTimeoutService, this.logService);
+            }(), this.vaultTimeoutService, this.logService, this.cryptoFunctionService);
     }
 
     async bootstrap() {