* Move color values to constant
* Fix MonacoPreview flickering on file selection and resizing
* Fix MarkdownPreview flickering on file selection and resizing
* Fix SvgPreview flickering on file selection and resizing
* Create Settings class and standardize background setting for MarkdownPreview
* Replace ColorTranslator.FromHtml with Color.FromArgb for constant color settings
* Use existing SetBackground
* Remove duplicate GetTheme function
* Update src/modules/previewpane/MarkdownPreviewHandler/Settings.cs
* Added get_key to powertoysmodule interface
* Replace get_name with get_key
* Implement get_key function in modules
* Make key global constant in each module
* Update settings v1 to use key to load and save files
* Fixed fancyzones and preview pane unit tests
* Removed setings unit test as the case is not covered anymore
* Add constant files for modules and use it to reference module key
* Add constant string files to colorpicker, launcher and shortcut guide
* correct sunction signature in settings helper
* Fix powerpreview merge conflicts
* nit fix with include statement location
* add check for fields in from_json_string
* Updated preview pane tests with correct from_json_string signature
* Correct Image resizer naming
* Roll back changes for adding check for property and version
* Fix image resizer not working
