2.x.x Template struct (#22)

* Start of turning template into a struct

* Everything is Sendable now, just doesnt work

* Add library to context

* Make sure render is initialized with library

* comment about inheritance spec

* Add register back in

* Re-instate register functions

* Re-instate commented out print

* Fix tabbing in Partial tests

* Make HBMustacheLibrary.loadTemplates async

* Update platforms, swift version

.github/workflows/ci.yml

@@ -40,9 +40,10 @@ jobs:
     strategy:
       matrix:
         image:
-          - 'swift:5.6'
           - 'swift:5.7'
           - 'swift:5.8'
+          - 'swift:5.9'
+          - 'swiftlang/swift:nightly-5.10-jammy'
     
     container:
       image: ${{ matrix.image }}