Update structures for 53.15

[ab9rf]

And a few other minor tweaks:

• Fix vmethod signature in art_image_propertyst
• Remove some stale unordered_map / unordered_set comments

[github-actions]

The sizes of the following types have changed in this pull request. Please verify that this is intentional. Note that renamed types are not currently detected and will also be listed here.

Type	Platform	Previous size	New size (this PR)	Change
creature_graphics_layer_setst	linux64	136	224	+88
creature_graphics_layer_setst	windows64	136	232	+96
creature_graphics_layerst	linux64	448	456	+8
creature_graphics_layerst	windows64	448	456	+8
layer_set_templatest	linux64	0	56	+56
layer_set_templatest	windows64	0	56	+56
region_object_datast	linux64	912	920	+8
region_object_datast	windows64	912	920	+8
texture_handlerst	linux64	48	72	+24
texture_handlerst	windows64	48	72	+24
viewscreen_adopt_regionst	linux64	2488	2496	+8
viewscreen_adopt_regionst	windows64	2184	2192	+8
viewscreen_loadgamest	linux64	2408	2416	+8
viewscreen_loadgamest	windows64	2104	2112	+8
viewscreen_new_regionst	linux64	1304	1312	+8
viewscreen_new_regionst	windows64	1264	1272	+8
world	linux64	2553248	2553256	+8
world	windows64	2553456	2553464	+8
worldgen_parms	linux64	1216	1224	+8
worldgen_parms	windows64	1216	1224	+8

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