v0.1.5_1-alpha: Copy results supports copy with headers (#386)

Fixes #368.
- Added a config option to support copy with column name header. Defaults to false to match SSMS behavior
- Support this during the copy event
- Context menu support for both Copy and Copy with Headers
- Unit tests will be added once the main unit test PR for the ResultsView is merged, since this has the necessary hooks and files.
- includes tests to cover all inputs to copyResults

v0.1.5.0 - Initial release of MSSQL Extension

Creating this release for tracking purposes, so that changes made after this can be tracked cleanly in our changelog