Merge TactilityHeadless into Tactility (#263)

There currently is no practical use to have TactilityHeadless as a subproject. I'm merging it with the Tactility project.

Tactility/Source/service/ServiceInstance.cpp

@@ -0,0 +1,17 @@
+#include "Tactility/service/ServiceInstance.h"
+#include "Tactility/service/ServiceInstancePaths.h"
+
+namespace tt::service {
+
+ServiceInstance::ServiceInstance(std::shared_ptr<const service::ServiceManifest> manifest) :
+    manifest(manifest),
+    service(manifest->createService())
+{}
+
+const service::ServiceManifest& ServiceInstance::getManifest() const { return *manifest; }
+
+std::unique_ptr<Paths> ServiceInstance::getPaths() const {
+    return std::make_unique<ServiceInstancePaths>(manifest);
+}
+
+}