fixed reassignment, starting work on if statements

tests/test.pla

@@ -1,7 +1,11 @@
 main = Func(): Int {
-	x: Int = 0;
+	x: Int = 123;
 
-	x = x * 2;
+	if x == 123 {
+		x = 0;
+	} unless {
+		x = 1;
+	}
 
 	return x;
 }