Patch release for remodeler generator

• Fix ArgumentNullException when Generating without docs -NoDocs switch (#711)

M4 release on master branch

Major changes

• Upgrade modeler from remodeler(m3) to modelerfour(m4)
• Profiles are not supported since it is not supported in m4
• Except for profiles, the new generator based on m4 is backward compatible
• Since removing profiles is a breaking change, bump the generator version to 3.0.*

How to specify the generator you want to use explicitly

Use m4 generator

autorest --use:@autorest/powershell@3.0.402

Use m3 generator

autorest --use:@autorest/powershell@2.1.201

Currently, by default the latest m3 generator will be used if '--use' is not provided. And soon, the default one be changed to the latest m4.

autorest.powershell-2.2.3

• Add support for 'no-inline'
• Fixed a few issues
• Merge some fixes from the master branch

Add support for common utils

 Generate model for all the dictionaries and add support for unixtime…

… (#685)

* Enable two test cases, and drop the workaround for x-ms-enum

* Add utils folder include a script to decrypt securestring

* Generate model for all the dictionaries and add support for unixtime

Use m4 4.15.414

Use '--use:https://tinyurl.com/y3yhmrgq' to use this preview version

m4 generator

Use '--use:https://tinyurl.com/y6szsbsp' to use this preview version