* Update form .NET Core 2.2 to .NET Core 3.1
- Global variable for projects
- Change TFMs from netcoreapp2.2 to netcoreapp3.1
- Update global.json
- Update build.json
- Remove direct framework cake TestCore task
- Update travis dotnet version
- Update azure pipline file
- Update vscode launch.json
* Add Central Package Management
* Fix xUnit Breaking Change for MemberData type
* Fix xUnit breaking change for duplicate test method name
* Fix Rang/Index type conflict with System.Rang/Index
* Update vscode tasks.json
* Change serviceHostExecutable path in ServiceTestDriver.cs
* Downgrade SDK version (https://github.com/appveyor/ci/issues/3440)
- Appveyor hasn't installed latest SDK therefore I downgrade it until they install it.
* Dump Microsoft.SqlServer.DACFx
* Fix tools service to store the corrected file path
* Use ClientFilePath for key
* Further fixes
* Undo spacing changes
* Fix tests
* Trigger CI rebuild
* Add LanguageFlavorNotification handling and refactor LanguageService
- Added new notification handler for language flavor changed
- Refactored the LanguageService so that it no longer relies on so many intertwined static calls, which meant it was impossible to test without modifying the static instance. This will help with test reliability in the future, and prep for replacing the instance with a service provider.
* Skip if not an MSSQL doc and add test
* Handle definition requests
* Fix diagnostics handling
