HAL renaming & relocation (#215)

Implemented more consistent naming:
- Moved all HAL devices into their own namespace (and related folder)
- Post-fixed all HAL device names with "Device"

TactilityHeadless/Include/Tactility/hal/keyboard/KeyboardDevice.h

@@ -0,0 +1,24 @@
+#pragma once
+
+#include "../Device.h"
+
+#include <lvgl.h>
+
+namespace tt::hal::keyboard {
+
+class Display;
+
+class KeyboardDevice : public Device {
+
+public:
+
+    Type getType() const override { return Type::Keyboard; }
+
+    virtual bool start(lv_display_t* display) = 0;
+    virtual bool stop() = 0;
+    virtual bool isAttached() const = 0;
+
+    virtual lv_indev_t* _Nullable getLvglIndev() = 0;
+};
+
+}