this doesn't replace or change anything yet, just bunch of Operation types for next step.

next step is creating CSharp/VBFactory which return these Operation type and replace callsite that return bound node with this.

after that, I will create xml/generator from Operation.xml.Generated.cs which can produce Operation.xml.Generated.cs

Update common references to v4.6 in TestWorkspace

Also fixed tests that were affected by changing the references

moving squiggles tests to new framework

Provide an option to choose which database to use to persist data.

Extract code related to DB persistent, but not specific to Esent, into its own class.

Replace file existence check of $(IbcMergePath) with an empty property check

moving error list tests to new framework

Properly preserve doc comments when converting a property into a method.

first step on separating IOperation from BoundTree.

propsed change for up-for-grabs label

Make a minimal edit in completion when it is safe to do so.

Support camel cased matching, even if the pattern was entirely lowercase.

Add option for 'use expression body for single line'

Highlight the DisplayText and not the FilterText when highlighting completion items.

this is easy step. just spliting all IOperations as its own files and put them in its own folder

Only offer ?? for reference types.

moving Workspace tests to new framework

Address null ref when we can't get an Undo manager.

Fixes https://github.com/dotnet/roslyn/issues/17898

add an ability to restart OOP

Don't offer to inline _ as that could become a discard.