variables of the desired type

This reverts commit 646489a3.

* Build color schemes into pkgdef resources

* Add files to read items from PKGDEF files

* Apply ColorScheme PKGDEF as defaults colors

* Add ColorScheme dropdown to Advanced Options page

* Update formatting for contributed PkgDef files

* Add margin to custom theme warning

* Address ColorApplier feedback

* Updated based on PR feedback

* Change to a VsixColorCompiler package that includes VC runtime

* Remove VsixColorCompiler

* Move native methods

* Remove PKGDEF reading

* Add additional color options to ColorSchemeOptions

* Add color scheme reader for reading the scheme XML

* Add coverter for turning color schemed into registry entries

* Update applier to read schemes from xml

* Initialize applier on package load

* Update option pages to refresh onLoad

* Remove VsixColorCompiler PackageReference

* Implement feedback from Code Review

* More feedback from Code Review

* Update file headers

* WIP

* Resolve PR feedback

* Use SchemeName in place of name strings

* Fix options persistence

* Make OptionChanged event nullable

* Revert change to GlobalOptionService

* Revert to using VisualStudioWorkspace for accessingOptions

No engine work

And feed it back into the grid

Literally just the button, nothing happens when you click it. However, the button is accessible and INPC unit tested.

1. Make the strings sentence cased
2. Rename "Open Documents And Projects" to "Open documents" as per internal review.