Rework the main API"s that implement the calling convention. Provide utility methods to get arguments that were supplied, and provide return values. Add a VM interface to clarify the relationship between the VM, things that call the VM, and things that are called by the VM. Make the code more closely aligned with the C++ version.

src/main/java/lua/value/LString.java

@@ -27,11 +27,6 @@ public class LString extends LValue {
 		return m_hash;
 	}
 
-	// TODO: what to do with LuaState? 
-	public LString(StackState l, String string) {
-		this(string);
-	}
-
 	public boolean luaBinCmpUnknown(int opcode, LValue lhs) {
 		return lhs.luaBinCmpString(opcode, m_string);
 	}