system: move system access packages

These packages loosely belong in the "system" package and "system" provides high level wrappers for all of them.

Signed-off-by: Ophestra <cat@gensokyo.uk>

system/wayland/wayland-client-helper.h

@@ -0,0 +1,4 @@
+#include <stdint.h>
+
+int32_t hakurei_bind_wayland_fd(char *socket_path, int fd, const char *app_id,
+                                const char *instance_id, int sync_fd);