Migrate featureinfobox to Tailwind

- migrate featureinfobox to Tailwind
- migrate featureinfobox-content to Tailwind
- migrate fullscreenmessage-content to Tailwind so we can delete css/fullscreenmessagebox.css

The landscape-mode is somethign that Tailwind does not support AFAIK. Instead, I migrated the one css-definition that was left over but required to a tailwind-like class name `.landscape\:max-h-screen`. Note the escaped colon with is required so css supports colon based class names.

UI/BigComponents/FullWelcomePaneWithTabs.ts

@@ -74,7 +74,7 @@ export default class FullWelcomePaneWithTabs extends UIElement {
         const backButton = new Combine([
             new Combine([Translations.t.general.returnToTheMap.Clone().SetClass("to-the-map")])
                 .SetClass("to-the-map-inner")
-                
+
         ]).SetClass("only-on-mobile")
             .onClick(() => State.state.fullScreenMessage.setData(undefined));