Deprecate password property; improve descriptions of default connections

Author: gjsjohnmurray

package.json

@@ -80,23 +80,23 @@
                 "host": "127.0.0.1",
                 "port": 52773
               },
-              "description": "Connection to default local InterSystems IRIS™ installation. Delete if unwanted."
+              "description": "Connection to local InterSystems IRIS™ installed with default settings."
             },
             "cache": {
               "webServer": {
                 "scheme": "http",
                 "host": "127.0.0.1",
                 "port": 57772
               },
-              "description": "Connection to default local InterSystems Caché® installation. Delete if unwanted."
+              "description": "Connection to local InterSystems Caché® installed with default settings."
             },
             "ensemble": {
               "webServer": {
                 "scheme": "http",
                 "host": "127.0.0.1",
                 "port": 57772
               },
-              "description": "Connection to default local InterSystems Ensemble® installation. Delete if unwanted."
+              "description": "Connection to local InterSystems Ensemble® installed with default settings."
             },
             "/default": "iris"
           },
@@ -158,7 +158,8 @@
                 },
                 "password": {
                   "type": "string",
-                  "description": "Password of username. If not set here it must be provided when connecting."
+                  "description": "Password of username.",
+                  "deprecationMessage": "Storing password in plaintext is not recommended. Instead, use the Command Palette command to store it in your keychain."
                 },
                 "description": {
                   "type": "string",