Project restructuring (fixes macOS builds) (#198)

- Create `Include/` folder for all main projects
- Fix some issues here and there (found while moving things)
- All includes are now in `Tactility/` subfolder and must be included with that prefix. This fixes issues with clashing POSIX headers (e.g. `<semaphore.h>` versus Tactility's `Semaphore.h`)

Tactility/Include/Tactility/Tactility.h

@@ -0,0 +1,41 @@
+#pragma once
+
+#include "Tactility/app/AppManifest.h"
+
+#include <Tactility/hal/Configuration.h>
+#include <Tactility/service/ServiceManifest.h>
+#include <Tactility/TactilityConfig.h>
+
+namespace tt {
+
+namespace app::launcher { extern const app::AppManifest manifest; }
+
+/** @brief The configuration for the operating system
+ * It contains the hardware configuration, apps and services
+ */
+struct Configuration {
+    /** HAL configuration (drivers) */
+    const hal::Configuration* hardware = nullptr;
+    /** List of user applications */
+    const std::vector<const app::AppManifest*> apps = {};
+    /** List of user services */
+    const std::vector<const service::ServiceManifest*> services = {};
+    /** Optional app to start automatically after the splash screen. */
+    const std::string launcherAppId = app::launcher::manifest.id;
+    /** Optional app to start automatically after the splash screen. */
+    const std::string autoStartAppId = {};
+};
+
+/**
+ * Attempts to initialize Tactility and all configured hardware.
+ * @param[in] config
+ */
+void run(const Configuration& config);
+
+/**
+ * While technically nullable, this instance is always set if tt_init() succeeds.
+ * @return the Configuration instance that was passed on to tt_init() if init is successful
+ */
+const Configuration* _Nullable getConfiguration();
+
+} // namespace