Refactor files based on beta debug build (#645)

* Rename LegoUnkSaveDataWriter -> LegoCharacterManager

* Refactor mxomni into mxomni/mxmisc

* Refactor legoomni into legoomni/misc

* Resolve deps

* Refactor atom

* Refactor mxutil

* Refactor mxio

* Rename/relocate files

* Fix format

LEGO1/lego/legoomni/src/actors/isleactor.cpp

@@ -0,0 +1,18 @@
+#include "isleactor.h"
+
+// NOTE: This is copied from base class LegoActor. IsleActor may in fact be larger but we don't know yet.
+DECOMP_SIZE_ASSERT(IsleActor, 0x78)
+
+// STUB: LEGO1 0x1002c780
+MxResult IsleActor::Create(MxDSAction& p_dsAction)
+{
+	// TODO
+	return SUCCESS;
+}
+
+// STUB: LEGO1 0x1002c7b0
+MxLong IsleActor::Notify(MxParam& p_param)
+{
+	// TODO
+	return 0;
+}