Add LocalDbSqlTraceListener | add Cobertura report generation support

[AAATechGuy]

BugFix: xp_readerrorlog in SqlTraceController.Start() fails in SqlLocalDb https://github.com/GoEddie/SQLCover/issues/42

Fixes # .

• Fix failure when running xp_readerrorlog on SqlServer. The method is just to fetch log location. Provide a default log location for SqlServer to dump logs/traces, in case this command fails.

Changes proposed in this pull request:

• as above.

How to test this code:

• Run SqlCover.Start() on SqlLocalDb that fails for xp_readerrorlog.

Has been tested on (remove any that don't apply):

• SQL Local Db 2019 (done)
• Case-sensitive SQL Server instance
• SQL Server 2008
• SQL Server 2008 R2
• SQL Server 2012
• SQL Server 2014
• SQL Server 2016
• Amazon RDS
• Azure SQL DB

[AAATechGuy]

@GoEddie please help merge? I don't have permissions.

[GoEddie]

Thanks for this - corbertura support has been a long term want for me :)