Improve make_static_call

[Simn]

Opening a PR so that I have a single place to put my conclusions.

The problem with make_static_call is that it currently spawns a bunch of monomorphs that are never unified with anything. We have a mechanism now to unify typed call arguments and we should use it here.

However, we're running into problems with some tests related to @:multiType, in particular situations where we have Map<NotString, X> with NotString NOT being assignable to String but still supposed to end up as StringMap. This means a proper unification fails.

If we want to keep this behavior (related issues: #4777, #9712, #10098) we have to add a special case for it "somewhere". I'm having a hard time understanding why it should be justifiable to have a type that is not assignable to another type except when used as a key to Map. However, multiple people whose opinions I usually value highly are somehow totally fine with that idea, so maybe I just have to find the right mindset...

[Simn]

@kLabz Could you check how badly this messes up Shiro things? #4777 mentions CastleDB so I expect apocalypse.

[kLabz]

Yeah there are some failures:

src/Console.hx:1117: characters 18-27 : error: RegionKind should be String
src/Console.hx:1117: characters 18-27 : ... have: haxe.IMap<RegionKind, ...>
src/Console.hx:1117: characters 18-27 : ... want: haxe.IMap<String, ...>

[kLabz]

Hide breaks too. Need HeapsIO/hide#230 for module resolution, and then we get

hrt/prefab/l3d/HeightMap.hx:805: characters 47-56 : error: hrt.prefab.l3d.HeightMaPTexturePathKind should be String
hrt/prefab/l3d/HeightMap.hx:805: characters 47-56 : ... have: haxe.IMap<hrt.prefab.l3d.HeightMaPTexturePathKind, ...>
hrt/prefab/l3d/HeightMap.hx:805: characters 47-56 : ... want: haxe.IMap<String, ...>

[Simn]

Alright, thanks... so we need more hacks.