Update to U43.5: Fables & Frontiers stuff

[AnSq]

AI Disclosure:

• I did not use AI for anything in this pull request.
• I did use AI in this pull request, and I have included a statement of AI use in the commit message of every commit where I used AI.

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Updated to U43.5(.4):

• New Daily task: Fables & Frontiers KIM
• New Weekly task: "Oops! All Eximus!" mission
• Bump version to v5.3.2

Plus:

• Replaced icon for weekly Hunhow vendor
• Added a PNG optimization script (a one-liner I've been using on all the images I add. I figured I should write it down instead of having to search my bash history every time I go to use it.)