Add MessageBroker for QML and native communication

Introduces MessageBroker to enable communication between the dylib and QML via signals. Updates CMakeLists.txt to include Qml components and conditionally add MessageBroker sources in qmlrebuild mode. reMarkable.m is updated to register the QML type, set up native callbacks, and demonstrate broadcasting signals.

src/utils/MessageBroker.mm

@@ -0,0 +1,58 @@
+// Credits: asivery/rm-xovi-extensions 
+// (https://github.com/asivery/rm-xovi-extensions/blob/master/xovi-message-broker/src/XoviMessageBroker.h)
+
+#import <Foundation/Foundation.h>
+#include "MessageBroker.h"
+#include "Logger.h"
+#include <vector>
+#include <cstring>
+#include <algorithm>
+
+static std::vector<MessageBroker *> brokers;
+static NativeSignalCallback nativeCallback = nullptr;
+
+void messagebroker::setNativeCallback(NativeSignalCallback callback) {
+    nativeCallback = callback;
+    NSLogger(@"[MessageBroker] Native callback registered");
+}
+
+void messagebroker::addBroadcastListener(MessageBroker *ref) {
+    // Cannot have more than one.
+    if(std::find(brokers.begin(), brokers.end(), ref) == brokers.end()) {
+        brokers.push_back(ref);
+        NSLogger(@"[MessageBroker] Added broadcast listener, total: %zu", brokers.size());
+    }
+}
+
+void messagebroker::removeBroadcastListener(MessageBroker *ref) {
+    std::vector<MessageBroker *>::iterator iter;
+    if((iter = std::find(brokers.begin(), brokers.end(), ref)) != brokers.end()) {
+        brokers.erase(iter);
+        NSLogger(@"[MessageBroker] Removed broadcast listener, remaining: %zu", brokers.size());
+    }
+}
+
+void messagebroker::broadcast(const char *signal, const char *value) {
+    QString qSignal(signal), qValue(value);
+    NSLogger(@"[MessageBroker] Broadcasting signal '%s' with value '%s'", signal, value);
+    
+    // Call native C++ callback if registered
+    if (nativeCallback) {
+        nativeCallback(signal, value);
+    }
+    
+    // Notify QML listeners
+    for(auto &ref : brokers) {
+        if(ref->getListeningFor().contains(qSignal)) {
+            emit ref->signalReceived(qSignal, qValue);
+        }
+    }
+}
+
+void messagebroker::registerQmlType() {
+    qmlRegisterType<MessageBroker>("net.noham.MessageBroker", 1, 0, "MessageBroker");
+    NSLogger(@"[MessageBroker] Registered QML type net.noham.MessageBroker");
+}
+
+// Include MOC output for MessageBroker class (generated by Qt's Meta-Object Compiler)
+#include "moc_MessageBroker.cpp"