The imported build tasks targets sets a nonexistent default target

Unify the source of compiler toolset files

This check existed to verify that the two lists of compiler files was
kept in sync. Now that there is only one list there is no reason to run
the check anymore.

Remove unused tool ProcessWatchDog

Use TargetFrameworks

Update feed tasks version

Emabarrasing typo from a previous PR

This removes the last usages of the CompilerFiles hard coded list of
files in favor of the version read from the toolset nuspec. This reduces
the number of places that need to be kept in sync when we make changes.

This changes the file set used to build the VS toolset to match that of
the standard compiler toolset. Simply re-use the file list in the
compiler nuspec file here.

This actuall found a bug in our current implementation. We were not
copying the config file for csi.exe in the VS toolset.

All of the XML literals in the file use the same xmlns value. Set a
global import so we can simplify the building of the literals.

Move to single toolset package

Simplify pull request template for users

Related to #22548 and #22229.

This merges the base and core toolset files into a single project file.
It uses multi-targeting to achieve the effect of having multiple files.

Fixes #23100

Restore toolset packages to Obj directory

The toolset packages were all restoring to the source directory. This
violates our build principal of builds should never write to the source
directory.

Changed to restore to the Obj directory as the rest of our code does.
Temporarily went back to the old MSBuild syntax. This will move to the
new MSbuild syntax with the rest of the repo.

The general principal here is that source directories should be
immutable. Ideally builds should be done with the write permissions set
to deny on the entire source tree. Having an immutable source tree helps
ensure that:

- Builds are repeatable: Any mutation, even simply new files, means it's
new input for the next build to see and potentially alter behavior.
- Builds can run in parallel: The source tree is read many times during
build. Any mutation to the tree can impact parallelization as order of
reads and writes must now be taken into account.

Remove some workarounds that are not needed anymore

Handle an empty span for 'introduce variable' refactoring

Provider a user option to enable/disable the 'Use auto property' analyzer

Enabled 'Use Local Function' refactoring for delegate which is invoked with Invoke

Escape keyword argument names in 'add argument name' refactoring

Fixes #23351.

Fix for #22690 NRE in GetAttributeSyntaxNodeOfToken in AbstractInternalsVisibleToCompletionProvider

Delete legacy deferred solution support

Correcting a possible copy and paste error, should be `FULLWIDTH_LATIN_SMALL_LETTER_B`.

Extended integer prefix tests to cover full range of permitted characters.

Change to newest version, which has some additional timeout fixes

Revert "Disable autosign of SWIX projects"