Fixes #15217

Also, change the column header from "Style" to "Required Style"

Fixes part 2 of #9674 for both the general code style page and the
naming style option page.

This also removes the superfluous "EnforcementLevel" class in the
NamingPreferences namespace that was basically a duplication of
"NotificationOption"/"NotificationOptionViewModel" in the general
CodeStyle namespace.

Fixes #12669. Addresses one part of #9674

Fixes both the general code styles page and the naming styles page

This reverts commit 9f30b914.

This reverts commit 12ce69e2.

Reverting this because it is causing VSI test failures, especially around Razor.

This change also introduces Specification and Style management (deleting and editing).

Also, fixes #14358

Now that our existing options have been tagged with the appropriate
metadata, we can use that metadata to drive serialization. This
updates IOptionSerializers to make them no longer have any language-
specific metadata, and are simply driven from the metadata included
on the option.

This also renames IOptionSerializer to IOptionPersister, which is
a better name.

Since we only apply the options that finally changed, this behavior
should be redundant, but requires us to categorize options in a not-
obvious way.

* Roslyn side changes for the new toggle button added to the Error list to turn on/off full solution analysis

We are moving the "Enable full solution analysis" option from Tools Option to the error list for improved discoverability, while also making it language agnostic. This change ensures that we set the Roslyn full solution analysis options when this button is toggled in the error list. Additionally, when we identify that the error list toggle button is available (Dev14 U3 or later), we will hide the tools option checkbox for "Enable full solution analysis" and show a note about it being moved to the error list. Note that we still continue with language specific defaults (C# off, VB on), but once the user has hit the error list toggle, the option setting is consistent across all languages.

Addresses workitem https://github.com/dotnet/roslyn/issues/11392

* Address PR feedback from Heejae - localization of strings.

* Address PR feedback from Heejae

* Address PR feedback

* Move to newer MS.VS.Shell.14.0 dll to consume the new error list changes.

* Move the code accessing the new IErrorList2 type into a separate method marked with [MethodImpl(MethodImplOptions.NoInlining)]

As a part of this change, I'm converting OptionSet from being a sealed,
non-publically creatable type to an abstract type. I have chatted with
@jaredpar and @davkean and we have all concluded this is a safe
operation to make, assuming that anybody who was constructing the type
is being recompiled. Since the only creator is within Roslyn itself,
this is safe. I did have to update our PublicAPI.Shipped.txt baseline,
because our public API checker includes modifiers in the list and is
unaware that this particular modification is safe.

Two APIs are added; Solution.Options exists that will eventually give a
snapshotted OptionSet to ensure the same snapshot guarantees you get
from the rest of the Solution API, and Document.Options exists to get
the options that apply to a specific Document. I considered adding
Project.Options, but discovered in practice nobody had a meaningful use
for it. I had expected it could be used when generating new documents,
but since style options can be specified on a file/folder basis, this
wouldn't be safe to use in that case.

This API isn't implemented in a meaningful way yet, but allows for
features to consume the new system once it exists.

Extract Interface (fixes #9958)
- Read textbox labels
- Read extractable members

Generate Type (fixes #9959)
- Read label text on dropdowns
- Read combobox items

Change Signature (fixes #9957)
- Read parameter and button text

Options pages (fixes #9962)
- Read labels/checkboxes/radiobuttons

This reverts commit ffec6afc.

to support this, I added a way to set different default value per language

to support this, I added a way to set different default value per language

.. is selected, use the first codestyle to show a preview.

Implements #7064

This change includes:

- An analyzer and codefix for enforcing naming styles and fixing symbol names to comply with a chosen & configurable set of naming rules.
- A set of Enforcement Levels that can be applied to different naming rules.
- A mechanism for linking from a lightbulb preview to the option that caused the related diagnostic to be created (could be moved to a different PR or release)
- Moving of the "Formatting" options pages under the Code Style node.

The BooleanCodeStyleOptionViewModel are a glue between older checkbox
style options and the new grid UI with severity levels. Well, the older
options don't have severity levels and I was throwing NotSupportedEx,
but forgot they were used in databinding. As a result we had non-fatal
exceptions. This change removes them.