WIP: Expand and document lib.cdc#40

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Wren6991 wants to merge 9 commits intom-labs:masterfrom

Wren6991:cdc_lib

Commits on Jun 11, 2019

lib.cdc: Add docstrings and basic parameter checking to MultiReg and ResetSynchroniser.
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lib.cdc: Add PulseSynchronizer and Gearbox modules, and smoke tests for these
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test_lib_cdc: test platform dependency injection
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lib.cdc: Implement BusSynchronizer and add smoke tests
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lib.cdc: Add ElasticBuffer and smoke test
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BusSynchronizer: lengthen request path, rather than shortening data path, so that data path benefits from MCP/falsepath constraints from MultiReg.
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lib.cdc: Fix description of ResetSynchronizer
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Commits on Jun 28, 2019