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...and add a semi-format that can be used to port code with the
'if modernGL then GL_R8 else GL_ALPHA' pattern (in order to support GLES
2.0).

...which comes handy to avoid problems of alloc, destroy, alloc
-> same address as before.

To help dealing with ancient GLES 2.0 implementations.

Shader resources are now set via a dedicated API (setShaderResources)
instead of setGraphicsPipeline.

Also extend docs about command buffers and defered command execution.

Do a little cleanup for gl and d3d when it comes to the "fake" command
queues.

the srb is nulled out anyways on each pass now

As the pass uses a different encoder.

sigh

Because we do not currently deal with this on d3d11.

Complements isYUpInFramebuffer().

For instance the Qt Quick renderer will want the Batchable variant for
a vertex shader when rendering merged batches. Make it possible to
communicate this to the backends.

Plus add a note for Metal.

Remove and leave out threading/rsh details for now as things are not
quite clear yet when it comes to QRhis operating in parallel with
one or more shared resource.

...in order to reduce code duplication.

The threaded case cannot be supported on all backends for now.
Revert parts of the previous d3d patch.

Some day we may consider exploring the possibility of doing something
with deferred contexts on d3d11 but that's not an option for now.

Here we choose to go the heavy weight route and turn it into a
d-pointered (implicitly shared, even) class since the data a binding
description needs may grow in yet-unknown ways when introducing support
for other resource types.

...and play with capture scopes as well. None of this will eliminate
the nextDrawable Called Early warning and the strangely-ordered frame
navigator view in XCode which is annoying but there is nothing we can
do about it.

so 'make docs' will start doing something now

...because we only really need to make sure arg changes are not skipped
upon a new pass, just changing the pipeline state has no effect on this.

Clarify the docs a bit as well.

...and even the entire draw call in some cases.

also start some minor optimizations to the imgui demo

Esp. for Metal where we now avoid superfluous set* for shader
resources.