Organize system calls

* syscalls should all return j6_status_t now
* syscalls are grouped by category in name as well as in files

src/kernel/syscalls/object.cpp

@@ -0,0 +1,24 @@
+#include "j6/errors.h"
+#include "j6/types.h"
+
+#include "log.h"
+#include "scheduler.h"
+
+namespace syscalls {
+
+j6_status_t
+object_noop()
+{
+	auto &s = scheduler::get();
+	auto *p = s.current();
+	log::debug(logs::syscall, "Process %d called noop syscall.", p->pid);
+	return j6_status_ok;
+}
+
+j6_status_t
+object_wait(j6_handle_t, j6_signal_t, j6_signal_t*)
+{
+	return j6_err_nyi;
+}
+
+} // namespace syscalls