Refactor idlist, move all global vars to local scope

- Replace list_foreach with LIST_FOREACH macro.
- Remove `game` global variable and make it local everywhere.
- Move global vars `fld`, `nxt` and `texts` into `game` struct.
- Add `static` qualifier to engine.c's specific global vars.
- Move `sfRenderWindow window` global var to local scope

1 files changed, 6 insertions, 0 deletions

diff --git a/include/common.h b/include/common.h
index 2273e4d..140044d 100644
--- a/include/common.h
+++ b/include/common.h
@@ -1,3 +1,5 @@
+struct field;
+
 struct game {
     size_t      level;
     int         started;
@@ -14,4 +16,8 @@ struct game {
     sfClock    *repPushDown;  // repeat latency when hold Down arrow
     sfClock    *repKeyLeft;   // repeat latency when hold Left arrow
     sfClock    *repKeyRight;  // repeat latency when hold Right arrow
+
+    struct field *fld;
+    struct field *nxt;
+    struct idlist *texts;
 };