ADLS Gen2, many bug fixes, support for VS2019, and many other improvements

[Jinming-Hu]

• Fix an issue that upload failed errno is overwritten, raised here https://github.com/Azure/azure-storage-cpplite/issues/47
• Support for VS2019
• ADLS Gen2
• [Breaking Change] Change API name: get_container_property->get_container_properties, get_blob_property->get_blob_properties. These two APIs now return std::future as other APIs
• Fix a few bugs in shared key signing
• Fix link issue of logger
• Fix dllimport/dllexport compiler warnings
• REST API version: 2018-11-09
• Fix a bug that get_container_properties never gets metadata
• Add two APIs: set_container_metadata, set_blob_metadata

[Jinming-Hu]

/AzurePipelines run Azure.azure-storage-cpplite

[azure-pipelines[bot]]

Azure Pipelines successfully started running 1 pipeline(s).

[Jinming-Hu]

/AzurePipelines run Azure.azure-storage-cpplite

[azure-pipelines[bot]]

Azure Pipelines successfully started running 1 pipeline(s).

[Jinming-Hu]

/AzurePipelines run Azure.azure-storage-cpplite

[azure-pipelines[bot]]

Azure Pipelines successfully started running 1 pipeline(s).

[Jinming-Hu]

/AzurePipelines run Azure.azure-storage-cpplite

[azure-pipelines[bot]]

Azure Pipelines successfully started running 1 pipeline(s).

[Jinming-Hu]

/AzurePipelines run Azure.azure-storage-cpplite

[azure-pipelines[bot]]

Azure Pipelines successfully started running 1 pipeline(s).

[Jinming-Hu]

@katmsft Can you take time to review the last commit https://github.com/Azure/azure-storage-cpplite/pull/50/commits/798991d70cbb74f98f0b1600fdbbedc08ca8aac2 in this pr, which adds get_request_header function due to the request from this issue https://github.com/Azure/azure-storage-cpplite/issues/51?