Reindent all C sources to the canonical stroustrup style

Mechanical whitespace-only change across src/, include/, tests/, and
util/, applied with scripts/reindent.sh. No behavioral change.

Most files already conformed. The genuine outliers indented at 2 columns
(json_helpers.c, util.c from akgl_rectangle_points onward, assets.c,
staticstring.c, akgl_actor_add_child, util.h, staticstring.h) or used
spaces where the canonical form is a tab (draw.c). cc-mode also re-aligns
line-continuation backslashes in multi-line macros to its default
c-backslash-column, which is required for the tree to be a fixed point of
the indenter.

Verified whitespace-only: `git diff -w` over this change is empty apart
from three trailing blank lines removed at EOF in src/heap.c,
src/registry.c, and tests/tilemap.c. The build produces no new errors and
ctest is unchanged at 13/14, with `character` still the one intentional
failure.

The tree is now a fixed point of `scripts/reindent.sh --check`.

include/akgl/SDL_GameControllerDB.h is generated and excluded.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

src/controller.c

@@ -104,7 +104,7 @@ akerr_ErrorContext *akgl_controller_handle_event(void *appstate, SDL_Event *even
 		}
 	    }
 	}
-_akgl_controller_handle_event_success:
+    _akgl_controller_handle_event_success:
     } CLEANUP {
     } PROCESS(errctx) {
     } FINISH(errctx, true);

src/heap.c

@@ -201,4 +201,3 @@ akerr_ErrorContext *akgl_heap_release_string(akgl_String *ptr)
     }
     SUCCEED_RETURN(errctx);
 }
-

src/registry.c

@@ -189,4 +189,3 @@ akerr_ErrorContext AKERR_NOIGNORE *akgl_get_property(char *name, akgl_String **d
     } FINISH(e, true);
     SUCCEED_RETURN(e);
 }
-

tests/actor.c

@@ -284,7 +284,7 @@ akerr_ErrorContext *test_actor_manage_children(void)
 		"Child %s was not removed from the registry",
 		(char *)&tmpstring->data);
 	}
-_test_actor_addchild_heaprelease_cleanup:
+    _test_actor_addchild_heaprelease_cleanup:
     } CLEANUP {
     } PROCESS(errctx) {
     } FINISH(errctx, true);

tests/tilemap.c

@@ -291,7 +291,7 @@ akerr_ErrorContext *test_akgl_tilemap_load_layers(void)
 	    ) {
 	    FAIL_BREAK(errctx, AKERR_VALUE, "Map layers 1 and 3 should have tile data but it is incorrect");
 	}
-_test_akgl_tilemap_load_layers_cleanup:
+    _test_akgl_tilemap_load_layers_cleanup:
     } CLEANUP {
 	if ( pathstr != NULL ) {
 	    IGNORE(akgl_heap_release_string(pathstr));
@@ -447,4 +447,3 @@ int main(void)
     } FINISH_NORETURN(errctx);
 
 }
-