Fix compiler bugs and text_editor

tests/accessing_variable_across_modules/main/test_unused.lc

@@ -0,0 +1,8 @@
+import b "second";
+
+main :: proc(): int {
+    a: int;
+    b.cool_variable = &a;
+    b.other_thing();
+    return 0;
+}

tests/accessing_variable_across_modules/second/second.lc

@@ -0,0 +1,7 @@
+
+cool_variable: *int;
+
+other_thing :: proc(): int {
+    a := 0;
+    return a;
+}