GTAD: update to support Matrix 1.11

Namely, GTAD itself had to be updated to support patternProperties and
mx-* format names; and gtad.yaml now substitutes `{{% boxes/note %}}`
with a Doxygen \note tag (see also
matrix-org/matrix-spec#1873).

Quotient/util.h

@@ -421,3 +421,11 @@ constexpr inline size_t mergeStruct(StructT& lhs, const StructT& rhs, const auto
 {
     return ((... + static_cast<size_t>(merge(lhs.*fields, rhs.*fields))));
 }
+
+// These are meant to eventually become separate classes derived from QString (or perhaps
+// QByteArray?), with their own construction and validation logic; for now they are just aliases
+// for QString to make numerous IDs at least semantically different in the code.
+
+using UserId = QString;
+using RoomId = QString;
+using EventId = QString;

gtad/gtad.yaml

@@ -1,7 +1,8 @@
 analyzer:
   subst:
-    "%CLIENT_RELEASE_LABEL%": r0
-    "%CLIENT_MAJOR_VERSION%": r0
+    # Escaping open braces because GTAD always treats subst keys as regexes, unlike other places
+    '\{\{% boxes/note %}}': '\note'
+    '( +)\{\{% /boxes/note %}}\n': '' # Delete the line with the closing handlebar entirely
   identifiers:
     signed: signedData
     unsigned: unsignedData
@@ -84,13 +85,16 @@ analyzer:
       - dateTime:
           type: QDateTime
           initializer: QDateTime::fromString("{{defaultValue}}")
-      - uri:
+      - uri: &Url
           type: QUrl
           initializer: QUrl::fromEncoded("{{defaultValue}}")
+      - mx-mxc-uri: *Url
+      - mx-user-id: UserId
+      - mx-room-id: RoomId
+      - mx-event-id: EventId
       - //: &QString
           type: QString
           initializer: QStringLiteral("{{defaultValue}}")
-          isString:
   - file: *ByteStream
   - +set: { avoidCopy: }
     +on:
@@ -122,11 +126,11 @@ analyzer:
         - /(room|client)_event.yaml$/: RoomEvents
         - /event(_without_room_id)?.yaml$/: Events
       - //: "QVector<{{1}}>"
-    - map: # `additionalProperties` in OpenAPI
+    - map: # `patternProperties` and `additionalProperties` in OpenAPI
       - RoomState:
-          type: "std::unordered_map<QString, {{1}}>"
+          type: "std::unordered_map<{{1}}, {{2}}>"
           moveOnly:
-      - /.+/: "QHash<QString, {{1}}>"
+      - /.+/: "QHash<{{1}}, {{2}}>"
       - //: QVariantHash # QJsonObject?..
     - variant: # A sequence `type` or a 'oneOf' group in OpenAPI
       - /^string,null|null,string$/: *QString