removed semantic version tracking code which recently caused some issue on RPS test. this code is already removed from master (15.5)

Breaks the internal GTD infrastructure into seperate symbols for
determining the navigable symbol at the caret position and performing
the navigation.

Fixes
https://devdiv.visualstudio.com/DevDiv/_workitems?id=391624&_a=edit

- Inline Rename fields now consist of a themeable/customizable
background, foreground, and border. The border is used in High Contrast.
- Resolved and Unresolved conflict borders can now be themed &
customized.
- Resolved and Unresolved conflict borders now have different dash
styles so they are distinct from each other and regular Inline Rename
fields. The Dashboard shows a key indicating which type of conflict
corresponds to which border dash style.

state progress as below

1. StartCandidacyRequirementsTracking <- first time user user LB (only once per user)
2. HasMetCandidacyRequirements <- when requirement is met (only once per user)
3. AnalyzerEnabledFlight <- when the user accepted as flight group (multiple times until user take action)
4. InfoBarShown <- when info bar is shown (multiple times until user takes an action)

actions user can take. (this can only happen once)
1. AnalyzerVsixHyperLine <- user choose to go to the link
2. NeverShowAgain <- user decide not to participate in the experiment

if user choose to install vsix (this can only happen once - unless user manually reinstall the vsix...)
1. Installed
2. Uninstalled

the first time user installed the vsix, we will report these extra info
1. DocumentDiagnostics - report only once per a document
2. ProjectDiagnostics - report only once per project

these 2 report include count per errors and FSA status. these only report once and never report again.

This is an automated migration of our project files to the new SDK /
PackageReference.  It is done using the tool located here:

https://github.com/jaredpar/ConvertPackageRef

Fixes https://github.com/dotnet/roslyn/issues/16562

While investigating #17570, I discovered that we would sometimes create
"deferred" Roslyn projects for .NET Core projects that just hadn't been
asynchronously created yet. In *theory* that did no functional harm - they would
just get closed and converted to real projects when the project system created
the real project, but might as well not even bother creating them.

While I'm here, clean up PR feedback from #17335.

We either don't use these, or pull them in from NuGet.

also, now merged separate vs telemetry logger to one since telemetry activity is now obsolete. also remote host also now share logger since both is now on new API

So, it turns out that when you AdviseSolutionEvents, the shell actually
checks the same object for all of the related solution events interfaces
to fire events to them. This meant that after commit
e6a43cb5, we never actually received any
IVsSolutionLoadEvents or IVsSolutionWorkingFoldersEvents. The impact of
this is that we never called "FinishLoad" to populate the Roslyn
workspace with the projects that had been loaded.

Most features would appear to work, as we would load a project and it's
dependencies when a file was opened, but we would then not load any
thing that depends on it, so features like Find All References and
Rename wouldn't work reliably.

Fixes
https://devdiv.visualstudio.com/DevDiv/_workitems?_a=edit&id=389698.

In Lightweight solution load, we depend on
IVsSolutionEvents.OnAfterOpenSolution being called to populate the
workspace and create projects.  However we were subscribing from
VisualStudioProjectTracker, which we defer create until a project is
opened.  This meant we never got the event for the first time a solution
was opened, and so we failed to populate the workspace.

move down diagnostic analyzer executor down to workspace layer since all requires one now lives in workspace layer.

This changes our build so it will no longer consider the GAC when resolving assembly references.

Ensure that all *.*proj, *.props, and *.targets files are prefixed with the xml and copyright elements