Sync item/material structures to Toady headers

[quietust]

Note that there are multiple breaking changes in this update:

• Item weight is now massst, which will also be used in caravan_state once I get to that
• spatter now includes spatter_common as a member rather than inheriting from it (so that we won't need padding hacks anymore for GCC)
• itemst::testMaterialFlag was wrong and has been changed to itemst::fitsCivRequestTab
• Any call sites for itemst::addWear or itemst::checkWearDestroy should be checked, as their parameters were out of order
• itemst::getItemDescriptionPrefix now uses an enum for its second parameter
• Anything looking at item_history_info previously expected a pointer-to-pointer; now there's an actual structure in between
• Anything still looking for the material flag LEAF_MAT will finally need to be updated to use STOCKPILE_PLANT_GROWTH, and the same for the organic_mat_category values "Leaf" and "CookableLeaf"
• Enough is enough - the plant_flags bitfield (watery/shrub) has been changed into the plant_type enum, regardless of how closely the current enum values resemble bitflags
• plant_tree_info had its extent_* fields named incorrectly (east/south/west/north, where Toady had sx/ex/sy/ey) - anything which actually used them should be checked for correctness

[github-actions[bot]]

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
article_type	linux64	0	4	+4
article_type	windows64	0	4	+4
builtin_mats	linux64	4	2	-2
builtin_mats	windows64	4	2	-2
clothing_layer_type	linux64	0	4	+4
clothing_layer_type	windows64	0	4	+4
corpse_material_type	linux64	4	2	-2
corpse_material_type	windows64	4	2	-2
creature_interaction_effect_cure_infectionsst	linux64	232	0	-232
creature_interaction_effect_cure_infectionsst	windows64	232	0	-232
creature_interaction_effect_type	linux64	4	2	-2
creature_interaction_effect_type	windows64	4	2	-2
creature_interactionst	linux64	0	24	+24
creature_interactionst	windows64	0	24	+24
environment_type	linux64	2	4	+2
environment_type	windows64	2	4	+2
glove_handedness	linux64	0	4	+4
glove_handedness	windows64	0	4	+4
inclusion_type	linux64	2	4	+2
inclusion_type	windows64	2	4	+2
interaction_effect_type	linux64	4	2	-2
interaction_effect_type	windows64	4	2	-2
interaction_source_type	linux64	4	2	-2
interaction_source_type	windows64	4	2	-2
interaction_target_type	linux64	4	2	-2
interaction_target_type	windows64	4	2	-2
intermittent_frequency_type	linux64	0	4	+4
intermittent_frequency_type	windows64	0	4	+4
item_corpsest	linux64	928	920	-8
item_liquid	linux64	192	184	-8
item_liquid	windows64	192	184	-8
item_magicalst	linux64	0	24	+24
item_magicalst	windows64	0	24	+24
item_magicness_type	linux64	2	4	+2
item_magicness_type	windows64	2	4	+2
item_matstate	linux64	4	0	-4
item_matstate	windows64	4	0	-4
item_powder	linux64	192	184	-8
item_powder	windows64	192	184	-8
item_profilest	linux64	0	8	+8
item_profilest	windows64	0	8	+8
itemdef_type	linux64	0	4	+4
itemdef_type	windows64	0	4	+4
massst	linux64	0	8	+8
massst	windows64	0	8	+8
material_common	linux64	1216	1240	+24
material_common	windows64	1216	1240	+24
material_template	windows64	1520	1528	+8
meat_category_type	linux64	0	4	+4
meat_category_type	windows64	0	4	+4
organic_mat_category	linux64	4	2	-2
organic_mat_category	windows64	4	2	-2
plant_flags	linux64	2	0	-2
plant_flags	windows64	2	0	-2
plant_type	linux64	0	4	+4
plant_type	windows64	0	4	+4
strain_type	linux64	4	2	-2
strain_type	windows64	4	2	-2
writing_role_type	linux64	0	4	+4
writing_role_type	windows64	0	4	+4
writing_style_modifier_type	linux64	0	4	+4
writing_style_modifier_type	windows64	0	4	+4

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