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/text.c

@@ -13,7 +13,7 @@
 akerr_ErrorContext AKERR_NOIGNORE *akgl_text_loadfont(char *name, char *filepath, int size)
 {
     TTF_Font *font = NULL;
-    
+
     PREPARE_ERROR(errctx);
     FAIL_ZERO_RETURN(errctx, name, AKERR_NULLPOINTER, "Null font name");
     FAIL_ZERO_RETURN(errctx, name, AKERR_NULLPOINTER, "Null filepath");
@@ -35,7 +35,7 @@ akerr_ErrorContext AKERR_NOIGNORE *akgl_text_rendertextat(TTF_Font *font, char *
     SDL_Surface *textsurf = NULL;
     SDL_Texture *texture = NULL;
     SDL_FRect dest;
-    
+
     PREPARE_ERROR(errctx);
     FAIL_ZERO_RETURN(errctx, font, AKERR_NULLPOINTER, "NULL font");
     FAIL_ZERO_RETURN(errctx, text, AKERR_NULLPOINTER, "NULL text string");