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`)

TactilityHeadless/Include/Tactility/time/Time.h

@@ -0,0 +1,32 @@
+#pragma once
+
+#include <string>
+
+namespace tt::time {
+
+/**
+ * Set the timezone
+ * @param[in] name human-readable name
+ * @param[in] code the technical code (from timezones.csv)
+ */
+void setTimeZone(const std::string& name, const std::string& code);
+
+/**
+ * Get the name of the timezone
+ */
+std::string getTimeZoneName();
+
+/**
+ * Get the code of the timezone (see timezones.csv)
+ */
+std::string getTimeZoneCode();
+
+/** @return true when clocks should be shown as a 24 hours one instead of 12 hours */
+bool isTimeFormat24Hour();
+
+/** Set whether clocks should be shown as a 24 hours instead of 12 hours
+ * @param[in] show24Hour
+ */
+void setTimeFormat24Hour(bool show24Hour);
+
+}