Include super basic memory arena

input.h

@@ -45,7 +45,7 @@ typedef enum {
 } mouse_keysym_t;
 
 #define IME_STR_MAX 200 // TODO: check if this limit is sensible
-#define KEYBOARD_KEY_TOTAL
+#define KEYBOARD_KEY_TOTAL 256
 
 typedef struct {
     uint8_t keyboard_state;               // mostly used to check if we are using the IME