Simplifies the gallery code #216
This PR removes all the unused code, variables and arguments present in the gallery screen including the never implemented zoom function. It also improves some variable names.
This PR might improve the performance somwhat, as Ren'py is predicting the CG gallery screen instead of predicting that weird 'looping' one.
All functionality should still be the same as before this PR.
No due date set.
No dependencies set.
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