[ticket/12043] Sort Extensions by Display Name in ACP Extension mananger

PHPBB3-12043
[ticket/12043] Correct try/catch exceptions for invalid extensions

PHPBB3-12043
[ticket/12043] Fix order of disabled extensions in unit tests

PHPBB3-12043
Merge remote-tracking branch 'vsephpbb/ticket/12043' into develop-ascraeus

* vsephpbb/ticket/12043:
  [ticket/12043] Fix order of disabled extensions in unit tests
  [ticket/12043] Correct try/catch exceptions for invalid extensions
  [ticket/12043] Sort Extensions by Display Name in ACP Extension mananger