Fixes, code enhancements
* remove lowercase call while parsing csv for adding users
* set user agent (https://github.com/tableau/tabcmd/pull/219)
* Add and clean up logging, always include version in logs (https://github.com/tableau/tabcmd/pull/234, https://github.com/tableau/tabcmd/pull/224)
* Encoding filter values to handle spaces and special chars in filters (https://github.com/tableau/tabcmd/pull/225)
* replace polling code with library call
* readme updates (https://github.com/tableau/tabcmd/pull/235)
* Read and warn when user sets thumbnail options. (including 'not yet implemented' message for --thumbnail-group)
* freeze tsc dependency (https://github.com/tableau/tabcmd/pull/248)
New functionality
* added new --filter option to pass in un-encoded value for simpler input
* Add --url, --include-all/--embedded-datasources for create/refresh/delete extract commands (https://github.com/tableau/tabcmd/pull/227)
* Add new command for listing content on the site (https://github.com/tableau/tabcmd/pull/230)
* Implement publishing options overwrite/append/replace arguments (including not-yet-implemented message for --replace) (https://github.com/tableau/tabcmd/pull/236)
* implement --proxy, --no-proxy, --use-certificate option (https://github.com/tableau/tabcmd/pull/241)
* add --token-file option (https://github.com/tableau/tabcmd/pull/243)
Attached executables:
Mac: download tabcmd.app.zip and unzip
Linux: download tabcmd.zip and unzip
Windows: executable removed for bugs, use an earlier version or install from pip/source
Known gaps from classic tabcmd:
* custom views are not supported in any operations
* the --proxy argument is not supported
* [createsiteusers ](https://help.tableau.com/current/online/en-us/tabcmd_cmd.htm#createsiteusers)does not support the --no-wait option
* [get](https://help.tableau.com/current/online/en-us/tabcmd_cmd.htm#get-url)/[export ](https://help.tableau.com/current/online/en-us/tabcmd_cmd.htm#get-url)size parameters are not respected
* [publish ](https://help.tableau.com/current/online/en-us/tabcmd_cmd.htm#publish-filenametwbx-filenametdsx-or-filenamehyper)does not support the --thumbnail-group option
* [refresh-extracts](https://help.tableau.com/current/online/en-us/tabcmd_cmd.htm#refreshextracts-workbookname-or-datasourcename) does not support incremental refresh, asynchronous refresh, or adding/removing calculations for an extract
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