More fixups for parameter block binding generation (#311)

* More fixups for parameter block binding generation

The bug in this case arises when there is both a parameter block and global-scope resources, all of which are relying on automatic binding assignment. If the parameter block is the first global-scope parameter that gets encountered, then it is possible for it to allocate regsiter space/set zero for itself, which confuses the logic for handling other global-scope parameters (which assumes that *they* get space/set zero).

I've also made some fixup to the reflection test harness and reflection API code:

- Have the hardness handle register-space allocations when printing, and be sure to only show their `index` and not their `space` (since that would be redundant)

- Have the reflection API only auto-redirect queries on a parameter group type layout to its container type layout *if* the container type layout has a non-zero number of resource allocations. The problem that arises here is a `ParameterBlock<X>` where `X` doesn't contain any uniforms, so that no container is needed. In that case the container ends up with no resource allocation(s).

* Fixups for test failures.

- The thread-group size tests failed because they had shader parameters with no resources to back them (built-in `SV_` inputs), and the printing of those changed. I fixed up the baseline, but also had to fix a few bugs in the reflection test fixture's printing logic.

- The GLSL parameter block test revealed a corner case of the existing logic: because we always need to generate a binding for the "hack" sampler (even if code doesn't end up needing it), and that sampler should always go in the "default" set (should be set zero), the user's `ParameterBlock` will always end up as `set=1` or later, even if there are no other global-scope parameters.

  - This will be fixed once we don't have to rely on glslang's annoying behavior in this one case, either because glslang gets fixed, or because we implement our own SPIR-V codegen.

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