Updating cc libs to fallback for clrie on Windows 7 (microsoft#2911)

Adding mono.cecil libs to packages, (microsoft#2878)

Mark early testhost startup APIs as internal for TP 16.10 (microsoft#…

…2768) (microsoft#2864)

* Marked test session APIs as internal

Updating code coverage version, (microsoft#2836)

Merging servicing fixes for 16.9.4 (microsoft#2837)

* Dynamic corelib.net loading (microsoft#2762) (microsoft#2803)

Code analysis with static analysers based on microsoft rules (microso…

…ft#2831)

Code refactoring.

Mark early testhost startup APIs as internal for TP 16.9 (microsoft#2768

)

* Marked test session APIs as internal
* Changed branding to 16.9.1 and updated CC externals

Co-authored-by: Codrin Poienaru <copoiena@microsoft.com>

Dynamic corelib.net loading (microsoft#2762)

* First working version,

* Calling async method,

* Cleaning code,

* Reverting changes,

* Fixing test,

* Copy to output required libs to fix tests

* Next fix

Co-authored-by: Jakub Chocholowicz <jachocho@microsoft.com>

Including `Microsoft.TestPlatform.AdapterUtilities` in signing (micro…

…soft#2719)

* Included missing assemblies in signing.

Upgrade CC to 16.9.0-beta.20630.1 (microsoft#2684)

Co-authored-by: Jakub Chocholowicz <jachocho@microsoft.com>