Rather than hardcode a bunch of SDK stuff, this is an attempt to move
SDK information to a declarative model. Each SDK gets a manifest, and
the manifests are stored in a shared repository.
Manifests encode stuff like "what platforms does this SDK build on" and
"what link flags do I need on each architecture".
This will hopefully reduce the complexity of the build scripts, since
going forward we only have to add new manifests, rather than figure out
how to attach more gunk into the build logic.
* Initial PVKII branch support
* Fix compiler error
* Add missing SE_PVKII check
* Update checkout-deps with 'pvkii'
* Change PVKII code to 10 and bump others by 1, including recommended change in provider_ep2.cpp:135
* Start using Github Actions
Test on all platforms. SourceHook tests are broken on windows
so allow failures until they're fixed.
* Only run the workflow for the master branch
