Reduce compilation time

[lboklin]

On my Ryzen 2600 it takes ~10 minutes to compile this library.

[DoctorRainer]

Only the first time? I was compiling Reflex about 1-2 hours :)

[suzumiyasmith]

An worse thing is, that stack haddock will crash your 16G RAM workstation.

[KaneTW]

I can't reproduce that. Maximum memory usage for stack haddock was 5 gigs.

[lboklin]

Intero will freeze my 16GB system when loading the Godot.Api.Auto module - maybe it's related.