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/service/wifi/WifiSettings.h

@@ -0,0 +1,33 @@
+#pragma once
+
+#include "WifiGlobals.h"
+#include <cstdint>
+
+namespace tt::service::wifi::settings {
+
+/**
+ * This struct is stored as-is into NVS flash.
+ *
+ * The SSID and secret are increased by 1 byte to facilitate string null termination.
+ * This makes it easier to use the char array as a string in various places.
+ */
+struct WifiApSettings {
+    char ssid[TT_WIFI_SSID_LIMIT + 1] = { 0 };
+    char password[TT_WIFI_CREDENTIALS_PASSWORD_LIMIT + 1] = { 0 };
+    int32_t channel = 0;
+    bool auto_connect = true;
+};
+
+bool contains(const char* ssid);
+
+bool load(const char* ssid, WifiApSettings* settings);
+
+bool save(const WifiApSettings* settings);
+
+bool remove(const char* ssid);
+
+void setEnableOnBoot(bool enable);
+
+bool shouldEnableOnBoot();
+
+} // namespace