userspace: Implement LibClipboard and ClipboardServer

programs can now connect to the clipboard server using libclipboard and
get and set the clipboard of the current user

userspace/libraries/LibClipboard/include/LibClipboard/Clipboard.h

@@ -0,0 +1,37 @@
+#pragma once
+
+#include <BAN/Span.h>
+#include <BAN/String.h>
+#include <BAN/StringView.h>
+#include <BAN/Vector.h>
+
+namespace LibClipboard
+{
+
+	static constexpr BAN::StringView s_clipboard_server_socket = "/tmp/clipboard-server.socket"_sv;
+
+	class Clipboard
+	{
+	public:
+		enum class DataType : uint32_t
+		{
+			None,
+			Text,
+			__get = UINT32_MAX,
+		};
+
+		struct Info
+		{
+			DataType type = DataType::None;
+			BAN::Vector<uint8_t> data;
+		};
+
+	public:
+		static BAN::ErrorOr<Info> get_clipboard();
+		static BAN::ErrorOr<void> set_clipboard(DataType type, BAN::Span<const uint8_t> data);
+
+		static BAN::ErrorOr<BAN::String> get_clipboard_text();
+		static BAN::ErrorOr<void> set_clipboard_text(BAN::StringView string);
+	};
+
+}