Release v1.5.42

Changes since v1.5.23:

• Engine: do not activate questionblocks when hitting them just by rising up
  on a platform. Matches Mario rules.
• Engine: minor module update.
• Level: minor visual improvement to Little & Big Platforms.
• Menu: fix crash in savestates menu when cheats are enabled.
• Menu: show the score for questionblocks a bit simpler. Now always 3 digits.
• Translations: add Japanese; thank you, Konishi Hiroto!