* 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
* Revert "Update SMO (#875)"
This reverts commit 96593d66e3.
* Revert "Switch Tools Service to new SMO and Microsoft.Data.SqlClient driver (#865)"
This reverts commit 9d140b53f3.
* Bump SMO to 160.1910315.0-preview
* send back success of include/exclude request
* update dacfx nuget package and use new api to get affected dependencies of include/exclude request
* addressing comments
* rename test
* Addressing comments
* switch to ambient props and targets files
* build against Microsoft.Data.SqlClient
* build tests
* fix test bug
* temporarily add SMO nuget to the repo
* update to released Microsoft.Data package
* pass AzureAcountToken if there is one
* Addressing comments
* formatting
* more formatting and moving getting connectionstring from constructor to CreateSchemaCompareEndpoint()
* updating dacfx with private nuget for testing
* Updating to real dacfx-preview version
* Removing additional refs added by nuget package manager (these were not there previously)
