Deprecate memset(3) over C99 compound literals for zero-init

Using memset(3) does not ensure pointers are assigned to NULL for all
platforms.

src/keyboard/src/keyboard.c

@@ -53,7 +53,7 @@ bool keyboard_justpressed(const struct keyboard *const k,
 
 void keyboard_init(struct keyboard *const k)
 {
-    memset(k, 0, sizeof *k);
+    *k = (const struct keyboard){0};
 }
 
 const char *keyboard_key_str(const enum keyboard_key k)

src/mouse/sdl-1.2/src/mouse.c

@@ -87,5 +87,5 @@ end:
 
 void mouse_init(struct mouse *const m)
 {
-    memset(m, 0, sizeof *m);
+    *m = (const struct mouse){0};
 }

src/player/src/human_player.c

@@ -711,7 +711,7 @@ int human_player_render(const struct human_player *const h,
 int human_player_init(const struct human_player_cfg *const cfg,
     struct human_player *const h)
 {
-    memset(h, 0, sizeof *h);
+    *h = (const struct human_player){0};
 
     if (player_init(&cfg->pl, &h->pl))
         return -1;