Misc fixes 1 (#1491)

* Some low-hanging UB

* document bug on z_file_nameset_NES.c

* ALIGNED on audio data

* document bug on decode

* document bugs on Message_Decode

* Format

* More ALIGNED

* Put the ALIGNED macro at the right like the other uses in the repo

* review

* fix Message Decode

(cherry picked from commit abfbc7068816756f7ea3fa4a36ee0fe664c54c72)

Co-authored-by: engineer124 <engineer124engineer124@gmail.com>

* remove comments

* Update src/overlays/gamestates/ovl_file_choose/z_file_choose_NES.c

Co-authored-by: engineer124 <47598039+engineer124@users.noreply.github.com>

* format

---------

Co-authored-by: engineer124 <engineer124engineer124@gmail.com>
Co-authored-by: engineer124 <47598039+engineer124@users.noreply.github.com>

src/code/z_common_data.c

@@ -1,6 +1,12 @@
-#include "global.h"
+#include "z64save.h"
 
-SaveContext gSaveContext;
+#include "alignment.h"
+#include "sequence.h"
+#include "libc/stdbool.h"
+#include "z64environment.h"
+#include "z64transition.h"
+
+SaveContext gSaveContext ALIGNED(16);
 
 void SaveContext_Init(void) {
     bzero(&gSaveContext, sizeof(SaveContext));