[develop] showcase dfc refactor

[G-e-n-e-v-e-n-s-i-S]

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[G-e-n-e-v-e-n-s-i-S]

In this PR I want to refactor the DFC frames:

magic-m15-showcase-innistrad-mid.mse-style -- Equinox
magic-m15-showcase-kaldheim.mse-style -- Vikings
magic-m15-showcase-kaldheim-dfc.mse-style -- DFC Vikings
magic-new-doublefaced.mse-style -- Modern Double-face
magic-new-planeswalker-doublefaced.mse-style -- Double-faced Planeswalkers
magic-new-omega-doublefaced.mse-style -- Omega Doublefaced
magic-new-doublefaced-sacrificer -- Sacrificer
magic-new-doublefaced-sparker -- Sparker
magic-m15-meld-3in1.mse-style -- Meld 3 in 1

Add update_card_scripts that break them down into their constituent faces.

I'm torn as to what to do with:

magic-m15-secret-lair-gatewatch.mse-style -- The Gatewatch

It's not really a DFC, cause it's just the same face on both sides, so if you export it as a single faced card, you don't actually lose any info... I think I'm just gonna leave it as is.

[G-e-n-e-v-e-n-s-i-S]

turns out there are too many missing assets so converting all the 8th edition DFC frames will wait for some other update. I'm gonna leave it at just the showcase frames.