Move C++ code into cpp/ dir (#941)

- Moved C++ code to cpp/ from src/raspberrypi
- Related updates to Makefile, easyinstall.sh, and the github build rules
- Removed the native X68k C code in src/x68k from the repo

cpp/controllers/controller_manager.cpp

@@ -0,0 +1,91 @@
+//---------------------------------------------------------------------------
+//
+// SCSI Target Emulator RaSCSI Reloaded
+// for Raspberry Pi
+//
+// Copyright (C) 2022 Uwe Seimet
+//
+//---------------------------------------------------------------------------
+
+#include "devices/device_factory.h"
+#include "devices/primary_device.h"
+#include "scsi_controller.h"
+#include "controller_manager.h"
+
+using namespace std;
+
+bool ControllerManager::AttachToScsiController(int id, shared_ptr<PrimaryDevice> device)
+{
+	auto controller = FindController(id);
+	if (controller != nullptr) {
+		return controller->AddDevice(device);
+	}
+
+	// If there is no LUN yet the first LUN must be LUN 0
+	if (device->GetLun() == 0) {
+		controller = make_shared<ScsiController>(bus, id);
+
+		if (controller->AddDevice(device)) {
+			controllers[id] = controller;
+
+			return true;
+		}
+	}
+
+	return false;
+}
+
+bool ControllerManager::DeleteController(shared_ptr<AbstractController> controller)
+{
+	return controllers.erase(controller->GetTargetId()) == 1;
+}
+
+shared_ptr<AbstractController> ControllerManager::IdentifyController(int data) const
+{
+	for (const auto& [id, controller] : controllers) {
+		if (data & (1 << controller->GetTargetId())) {
+			return controller;
+		}
+	}
+
+	return nullptr;
+}
+
+shared_ptr<AbstractController> ControllerManager::FindController(int target_id) const
+{
+	const auto& it = controllers.find(target_id);
+	return it == controllers.end() ? nullptr : it->second;
+}
+
+unordered_set<shared_ptr<PrimaryDevice>> ControllerManager::GetAllDevices() const
+{
+	unordered_set<shared_ptr<PrimaryDevice>> devices;
+
+	for (const auto& [id, controller] : controllers) {
+		const auto& d = controller->GetDevices();
+		devices.insert(d.begin(), d.end());
+	}
+
+	return devices;
+}
+
+void ControllerManager::DeleteAllControllers()
+{
+	controllers.clear();
+}
+
+void ControllerManager::ResetAllControllers() const
+{
+	for (const auto& [id, controller] : controllers) {
+		controller->Reset();
+	}
+}
+
+shared_ptr<PrimaryDevice> ControllerManager::GetDeviceByIdAndLun(int id, int lun) const
+{
+	if (const auto& controller = FindController(id); controller != nullptr) {
+		return controller->GetDeviceForLun(lun);
+	}
+
+	return nullptr;
+}