Housekeeping

Would it be better if I point out every commit related to the changes in the release note? Let me try it.

• make skins stand out better cd77d92, b9bee03, ff56223
• remove ambiguity on assignment texts 081ae3f
  'Push stick-left to right' isn't a clear text
• better deadzone decision 3fecbcb, e9086ae
• properly skip looking for dpad change for render when it doesn't exist in the mapping f99d08f
• fix Renderer getting undefined as a skin name when a new gamepad is found on a slot previously used c274653
• skipped inputs in the assignment process are properly assigned with null ed9296a
• small change on skins 48251e3, cf2bbcc
• tried to optimise Search Engine Result Page 5f8d958, 02e8291, 642cd16, 0e14c3e, 81353f5, 49fa62e, c2bd605