… Studio MSTest

…samples.

…ons to extensions.

…Helper` and improved.

…ests

Added types:

- PipeStream
- Process
- Socket

1. Rename `GUID` to `COID` meaning Common Object Identification Code.
2. Transform `COID` and `COID_Part` into Classes instead of Structs.
3. Overrided `ToString`, `Equals` and `GetHashCode` functions.
4. Updated related unit tests.

…nd improved functions.

…ted.

…d to net 7.0

…est.