Update filenames from plugins to modules

src/modules/TextMessageModule.h

@@ -0,0 +1,25 @@
+#pragma once
+#include "SinglePortPlugin.h"
+#include "Observer.h"
+
+/**
+ * Text message handling for meshtastic - draws on the OLED display the most recent received message
+ */
+class TextMessagePlugin : public SinglePortPlugin, public Observable<const MeshPacket *>
+{
+  public:
+    /** Constructor
+     * name is for debugging output
+     */
+    TextMessagePlugin() : SinglePortPlugin("text", PortNum_TEXT_MESSAGE_APP) {}
+
+  protected:
+
+    /** Called to handle a particular incoming message
+
+    @return ProcessMessage::STOP if you've guaranteed you've handled this message and no other handlers should be considered for it
+    */
+    virtual ProcessMessage handleReceived(const MeshPacket &mp) override;
+};
+
+extern TextMessagePlugin *textMessagePlugin;