Replaced hardcoded icon strings with FontSymbols constants in MoreMenu and converter classes for consistency and maintainability. Removed duplicate FontSymbols class from MidiPlayer and updated usages to reference QuickLook.Common.Controls.
Introduces 'Reopen as source code' and 'Reopen as image preview' options in the MoreMenu for SVG and HTML files, enabling users to switch between ImageViewer and TextViewer plugins. Updates translation files to support new menu items in multiple languages and refactors related plugin code for extensibility.
Updated the menu item and translations to use 'Reopen as source code' instead of 'View source code' across all supported languages for consistency and clarity.
