Shave 20 bytes by foricing isKeyboardModifier inline

src/kaleidoscope/key_defs.h

@@ -195,7 +195,7 @@ class Key {
   // modifier keys like `LSHIFT(Key_RightAlt)` and `Key_Meh`. It will not match
   // a key with only modifier flags (e.g. `LCTRL(RALT(Key_NoKey))`); this is an
   // intentional feature so that plugins can distinguish between the two.
-  constexpr bool isKeyboardModifier() const {
+  constexpr bool __attribute__((always_inline)) isKeyboardModifier() const {
     return (isKeyboardKey() &&
             (keyCode_ >= HID_KEYBOARD_FIRST_MODIFIER &&
              keyCode_ <= HID_KEYBOARD_LAST_MODIFIER));