516 Support Master Issue

[amylizzle]

BYOND 516 mostly just upgrades the browser elements to Webview2, but also adds a few new features:

• /vector (Initial vector implementation #2221)
  • /vector procs
  • /vector math operators
  • /vector for-loops
• new screen_loc keywords: SCREEEN_SOUTHWEST, SCREEN_NORTHEAST, etc
• sound.atom and sound.transform for moving sounds
• icon_w and icon_z
• some list operations for doing fast math on assoc lists values_sum, values_product, etc. (Implement 516 values_ procs #2213)
• lerp()
• sign() (Implement sign() #2207 )
• /callee in error handling
• operator<=>
• asslist alist - it's a dictionary. Why isn't it called dict? Nobody knows.
• #pragma syntax C ?????
• for(k,v in list) syntax
• load_ext()
• astype() (Implement astype() #2211)
• animate() now supports a tag argument for named animation sequences
• /pixloc - seems to just be wrapper for pos + (step_x, step_y)
• /atom.pixloc
• filter() now supports naming of filters and named filter lookup
• The ~= and ~! operators now take associated values into account when checking associative lists (Implement 516 behavior for ~= and ~! #2212)
• Byondapi gets Byond_CRASH()
• .sound client-side command
• SIDE_MAP and ISOMETRIC_MAP have had changes to their positioning behavior