Add checks for the SQL Server Buffer Manager and SQL Statistics taken from the system counters.
Add Counters for the SQL Server: Buffer Manager, Plan Cache, SQL Statistics, and Memory Manager
expand the ability to reconfigure the format of the name field
Refactor the Windows checks to be a even more flexible.

* All powershell CSV output columns can now be custom handled by each check
* SQL Server Tests use a config file for their parameters or skip the tests
* Checks can convert CSV entries to metrics using an inherited function
Add escaping of params passed to powershell and sql server
remove leading _ from _total_cache entries