fix(jinx.lic): v0.8.1 only define constants on first run

[mrhoribu]

Bump version to 0.8.1 and update changelog.

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Important

Fix constant redefinition issue in jinx.lic by checking if constants are already defined, update version to 0.8.1, and update changelog.

• Behavior:
  • Fix constant redefinition issue in jinx.lic by checking if constants are already defined before defining them.
  • Affected constants include FLAG_PREFIX, ElanthiaOnlineCore, ElanthiaOnlineExtras, FFNGLichRepoArchiveMirror, Gtk3ScriptUpdates, MapdbBackupGS, MapdbBackupDR, LOCK, FILE, HOOKS, DEFAULT_ENGINE, and MAX_LOG_LINES.
• Versioning:
  • Bump version to 0.8.1 in jinx.lic.
  • Update changelog to include fix for constant redefinition on subsequent launches.

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