Define power levels to disable calls/reactions/redaction/stickers in PM

No one but the sender can see them because we cannot bridge them.
Blocking them with PLs allows the clients to hide these features
from their UI, so users do not mistakenly believe they will be received.

Author: progval

spec/integ/pm.spec.js

@@ -284,7 +284,12 @@ describe("IRC-to-Matrix PMing", () => {
                             "m.room.canonical_alias": 100,
                             "m.room.history_visibility": 100,
                             "m.room.power_levels": 100,
-                            "m.room.encryption": 100
+                            "m.room.encryption": 100,
+                            "m.call.invite": 100,
+                            "m.call.candidate": 100,
+                            "m.reaction": 100,
+                            "m.room.redaction": 100,
+                            "m.sticker": 100,
                         },
                         invite: 100
                     },

src/bridge/IrcHandler.ts

@@ -195,7 +195,15 @@ export class IrcHandler {
                                     "m.room.canonical_alias": 100,
                                     "m.room.history_visibility": 100,
                                     "m.room.power_levels": 100,
-                                    "m.room.encryption": 100
+                                    "m.room.encryption": 100,
+                                    // Event types that we cannot translate to IRC;
+                                    // we might as well block them with PLs so
+                                    // Matrix clients can hide them from their UI.
+                                    "m.call.invite": 100,
+                                    "m.call.candidate": 100,
+                                    "m.reaction": 100,
+                                    "m.room.redaction": 100,
+                                    "m.sticker": 100,
                                 },
                                 invite: 100,
                             },