There is much left to do here. This is just the first pass, where I have
done nothing but try to clear out the errors caused by the upgrade. Not
all of the errors are cleared yet, largely because several exports from
glimmer-vm have been removed and I don't know how to replace them (help
wanted). Below is a list of the needed changes and problems I have
encountered in the upgrade process.

UPGRADE NOTES (starting at glimmer-vm 0.25.6)

* Simple is now in @glimmer/interfaces
* ComponentManager.getSelf cannot return null (returns RootReference?)
* ComponentManager.getTag returns ComponentStateBucket.tag (: Tag)
* Some code moved from ComponentManager.update to
* ComponentManager.didUpdate
* ComponentManager<ComponentStateBucket> -->
* ComponentManager<ComponentStateBucket, ComponentDefinition>
* ComponentManager.create signature changed
* ComponentStateBucket's defintion is now DefinitionState instead of
* ComponentDefinition
* ComponentManager.prepareArgs signature changed
* ComponentManager.getCapabilities is new
* CompiledDynamicTemplate is gone (no longer in runtime, anyway) see
* glimmerjs/glimmer-vm@79f2b45#diff-d561208b0ad153d9273c2188e16c7442
* Must implicitly include @glimmer/vm and @glimmer/opcode-compiler and
* @glimmer/encoder in ember-cli-build.js
* compileLayout -> scanLayout -> prepareLayout -> new WrappedBuilder
* isSafeString is no longer exported publicly. Is that intentional?
* normalizeTextValue is no longer exported publicly. Is that
* intentional?
* isComponentDefinition is gone, kind of replaced by
* `isCurriedComponentDefinition`. Neither is exported.
* getComponentDefintion is no longer part of Environment.
* referenceFromParts has been removed.
* f3444e9ae0c7751047bdcd856e61344bfb548e12
* readDOMAttr has been removed. 316805b9175e01698120b9566ec51c88d075026a

The contents are not rendering at all, and a lot of the code is not
handling error cases. This is just to get the component to render at
all.

The prepareArgs implementation is taken directly from glimmer-vm's
Emberish Curly component. I left the original implemenation in there,
commented out, because I feel like something from that original
implementation is probably necessary for the update implementation, but
I can't really say what.

It's still broken - infinite loop this time

make dynamic even when we know the layout statically

Using just a string is not enough because operations.setAttribute
expects a reference, not a primitive

and even though that is not correct, this test
navigates away from the page if it causes a click
on a detached anchor because there is no view to
prevent default. So temporarily work around it.

…namicComponent with a helper expression.

Good thing we have tests

It used to be in the dynamic component reference, but that's gone now.

optimize build for EMBER_GLIMMER_REMOVE_APPLICATION_TEMPLATE_WRAPPER

This pattern is allowed for `{{component` but was previously not allowed
for `(component`. It seems reasonable to have parity here, and I believe
we should allow `(component somethingNullOrNotFound` to be inert (and
not throw an error).

Issue deprecation when conflicting named and positional params exist
(changed from per-layer assert to post-merge deprecation).