Initial import of Red Planet v4.10 Win32 source

Imports the current Win32 source for the pod-racing game 'Red Planet',
built on the MUNGA engine and its L4 (Win32/DirectX) platform layer:

- MUNGA / MUNGA_L4: cross-platform engine core and Win32 backend
- RP / RP_L4: Red Planet game logic and Win32 application
- DivLoader, Setup1: asset loader and installer project
- lib, MUNGA_L4/openal, MUNGA_L4/sos: third-party audio dependencies

Removed stale Subversion metadata and added .gitignore/.gitattributes.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

MUNGA/APPMSG.cpp

@@ -0,0 +1,46 @@
+#include "munga.h"
+#pragma hdrstop
+
+#include "appmsg.h"
+#include "app.h"
+
+//~~~~~~~~~~~~~~~~~~~~~ Application__StateQueryMessage ~~~~~~~~~~~~~~~~~~~~~~~~
+Application__StateQueryMessage::Application__StateQueryMessage(HostID requesting_host)
+	: NetworkClient::Message(Application::StateQueryMessageID, sizeof(Application__StateQueryMessage))
+{
+	requestingHost = requesting_host;
+}
+
+//~~~~~~~~~~~~~~~~~~~~~~ Application__RunMissionMessage ~~~~~~~~~~~~~~~~~~~~~~~
+Application__RunMissionMessage::Application__RunMissionMessage()
+	: NetworkClient::Message(Application::RunMissionMessageID, sizeof(Application__RunMissionMessage))
+{
+}
+
+//~~~~~~~~~~~~~~~~~~~~~~ Application__StopMissionMessage ~~~~~~~~~~~~~~~~~~~~~~
+Application__StopMissionMessage::Application__StopMissionMessage(Enumeration exit_code)
+	: NetworkClient::Message(Application::StopMissionMessageID, sizeof(Application__StopMissionMessage))
+{
+	exitCode = exit_code;
+}
+
+//~~~~~~~~~~~~~~~~~~~~~~ Application__AbortMissionMessage ~~~~~~~~~~~~~~~~~~~~~~
+Application__AbortMissionMessage::Application__AbortMissionMessage(Enumeration exit_code)
+	: NetworkClient::Message(Application::AbortMissionMessageID, sizeof(Application__AbortMissionMessage))
+{
+	exitCode = exit_code;
+}
+
+//~~~~~~~~~~~~~~~~~~~~ Application__SuspendMissionMessage ~~~~~~~~~~~~~~~~~~~~~
+Application__SuspendMissionMessage::Application__SuspendMissionMessage()
+	: NetworkClient::Message(Application::SuspendMissionMessageID, sizeof(Application__SuspendMissionMessage))
+{
+}
+
+//~~~~~~~~~~~~~~~~~~~~ Application__ResumeMissionMessage ~~~~~~~~~~~~~~~~~~~~~~
+Application__ResumeMissionMessage::Application__ResumeMissionMessage()
+	: NetworkClient::Message(Application::ResumeMissionMessageID, sizeof(Application__ResumeMissionMessage))
+{
+}
+
+//==============================================================================