input: Introduce basic hyprland HID classes

Implements an intermediary HID class for mice, keyboards and touch devices, removing the old structs from WLClasses.hpp

Yes, virtual ones are duplicated a bit, but will likely be de-duped once wlr_input_device is not used anymore.

src/devices/IHID.hpp

@@ -0,0 +1,26 @@
+#pragma once
+
+#include <cstdint>
+#include <string>
+#include "../helpers/signal/Signal.hpp"
+
+enum eHIDCapabilityType : uint32_t {
+    HID_INPUT_CAPABILITY_KEYBOARD = (1 << 0),
+    HID_INPUT_CAPABILITY_POINTER  = (1 << 1),
+    HID_INPUT_CAPABILITY_TOUCH    = (1 << 2),
+};
+
+/*
+    Base class for a HID device.
+    This could be a keyboard, a mouse, or a touchscreen.
+*/
+class IHID {
+  public:
+    virtual uint32_t getCapabilities() = 0;
+
+    struct {
+        CSignal destroy;
+    } events;
+
+    std::string deviceName;
+};