Initial commit: bt411 -- standalone Windows BattleTech (Tesla 4.10 port)

Clean, self-contained extraction of the BattleTech-specific work from the
reverse-engineering workspace -- engine + game + content + build, with nothing
from Red Planet or the raw archive dumps. Builds green (Win32) and runs the
single-player drive->animate->target->fire->damage->destroy loop out of the box.

Layout:
  engine/   MUNGA + MUNGA_L4 shared 2007 engine, carrying our BT render/loader
            work (bgfload/L4D3D/L4VIDEO: BSL bit-slice decode, LOD/ground/shadow
            models) + image codec; the minimal rp/ headers the audio HAL needs
  game/     reconstructed BT logic + surviving-original BT source + fwd shims
            + WinMain launcher
  content/  full runtime tree (BTL4.RES, VIDEO/, GAUGE/, AUDIO/, eggs, BTDPL.INI)
  docs/     format specs + reconstruction ledgers
  reference/ raw Ghidra pseudocode (recon source-of-truth) + decomp exporter
  tools/    MP console emulator + map/resource scanners

One top-level CMake builds munga_engine lib + bt410_l4 game lib + btl4.exe.
All paths relativized (186 fwd shims + ~437 CMake abs paths -> repo-relative);
DXSDK is the one external, overridable via -DDXSDK. Verified: builds to a
byte-identical 2.27MB exe and runs combat (TARGET DESTROYED, 0 crashes) against
the bundled content.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

engine/MUNGA_L4/L4MPPR.h

@@ -0,0 +1,151 @@
+#pragma once
+
+#include "..\munga\controls.h"
+#include "..\munga\cammppr.h"
+
+//##########################################################################
+//####################         CameraL4Mapper           #######################
+//##########################################################################
+class CameraL4Mapper :
+	public CameraControlsMapper
+{
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Shared Data Support
+//
+public:
+	static Derivation *GetClassDerivations();
+	static SharedData DefaultData;
+
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Messaging Support
+//
+public:
+	void
+		KeypressMessageHandler(ReceiverDataMessageOf<ControlsKey> *message);
+
+protected:
+	static const HandlerEntry
+		MessageHandlerEntries[];
+	static MessageHandlerSet
+		MessageHandlers;
+
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Model Support
+//
+public:
+	typedef void
+		(CameraL4Mapper::*Performance)(Scalar time_slice);
+
+	void
+		InterpretControls(Scalar time_slice);
+
+	void
+		SetPerformance(Performance performance)
+			{
+				Check(this);
+				activePerformance = (Simulation::Performance)performance;
+			}
+
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Construction and Destruction Support
+//
+public:
+	CameraL4Mapper(
+		CameraShip *owner,
+		int subsystem_ID,
+		SubsystemResource *subsystem_resource,
+		SharedData &shared_data = DefaultData
+	);
+	~CameraL4Mapper();
+
+	Logical
+		TestInstance() const;
+
+protected:
+	ControlsScalar
+		leftPedal,
+		rightPedal;
+};
+
+//##########################################################################
+//####################    CameraThrustmasterMapper   #######################
+//##########################################################################
+
+class CameraThrustmasterMapper :
+	public CameraL4Mapper
+{
+
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Shared Data Support
+//
+public:
+	static Derivation *GetClassDerivations();
+	static SharedData DefaultData;
+
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Model Support
+//
+public:
+	typedef void
+		(CameraThrustmasterMapper::*Performance)(Scalar time_slice);
+
+	void
+		InterpretControls(Scalar time_slice);
+
+	void
+		SetPerformance(Performance performance)
+			{
+				Check(this);
+				activePerformance = (Simulation::Performance)performance;
+			}
+
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Construction and Destruction Support
+//
+public:
+	CameraThrustmasterMapper(
+		CameraShip *owner,
+		int subsystem_ID,
+		SubsystemResource *subsystem_resource,
+		SharedData &shared_data = DefaultData
+	);
+	~CameraThrustmasterMapper();
+
+	Logical
+		TestInstance() const;
+
+protected:
+	ControlsButton
+		throttleUp,
+		throttleDown;
+};
+
+//##########################################################################
+//###########################    CameraRIOMapper    ########################
+//##########################################################################
+
+class CameraRIOMapper :
+	public CameraL4Mapper
+{
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Shared Data Support
+//
+public:
+	static Derivation *GetClassDerivations();
+	static SharedData DefaultData;
+
+ //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Construction and Destruction Support
+//
+public:
+	CameraRIOMapper(
+		CameraShip *owner,
+		int subsystem_ID,
+		SubsystemResource *subsystem_resource,
+		SharedData &shared_data = DefaultData
+	);
+	~CameraRIOMapper();
+
+	Logical
+		TestInstance() const;
+};