Dwave-hybrid

New Features
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- Option to retry if embedding fails in `QPUSubproblemAutoEmbeddingSampler` (114)
- `ComponentDecomposer` for iterating over problem graph components (209)
- [`greedy`](https://docs.ocean.dwavesys.com/projects/greedy/en/latest/)-based `SteepestDescentProblemSampler`/`SteepestDescentSubproblemSampler`

Fixes
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- `SplatComposer` was producing `numpy.float64` samplesets (235). Now it inherits `dtype` from input.

Fixes
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- All QPU samplers now use client-based QPU selection instead of solver feature-based,
therefore allowing users to define the solver via Ocean configuration (228)

New Features
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- Added `SubproblemCliqueEmbedder`

Changes
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- Dropped Python 2.7 and 3.4 support

Fixes
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- Loosened NumPy version requirements

Fixes
---

- Minor docs/doctests updates

New Features
---

- Unified SDK docs

Fixes
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- Python 3.8 support
- Loosened NumPy version requirements

New Features
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- `ICM`/`IsoenergeticClusterMove` samples processor block
- `ExplodeSamples` block that splits sampleset samples into states
- `HybridSampler` can now return the final state produced by the
workflow, and it can propagate sampling parameters as workflow
run-time parameters

Fixes
---

- Properly handle list samples in `utils.flip_energy_gains`