Automatic changelog generation for PR #10014 [ci skip]

html/changelogs/AutoChangeLog-pr-10014.yml

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+author: rkz, Tiviplus, msgerbs, Ghommie, Fikou, necromanceranne
+delete-after: true
+changes:
+  - refactor: mechs are now a vehicle subtype, instead of Winter Wonderland snowflake
+      code
+  - tweak: mechs no longer need to use middle click as a janky override to utilize
+      their equipment.
+  - bugfix: fixed bugs with inconsistent mech equipment balloons/to_chat
+  - bugfix: fixed mechs with ballistics shooting themselves while moving