Vue initialization and FloatingMenu codebase refactoring and cleanup (#649)

* Clean up Vue initialization-related code

* Rename folder: dispatcher -> interop

* Rename folder: state -> providers

* Comments and clarification

* Rename JS dispatcher to subscription router

* Assorted cleanup and renaming

* Rename: js-messages.ts -> messages.ts

* Comments

* Remove unused Vue component injects

* Clean up coming soon and add warning about freezing the app

* Further cleanup

* Dangerous changes

* Simplify App.vue code

* Move more disparate init code from components into managers

* Rename folder: providers -> state-providers

* Other

* Move Document panel options bar separator to backend

* Add destructors to managers to fix HMR

* Comments and code style

* Rename variable: font -> font_file_url

* Fix async font loading; refactor janky floating menu openness and min-width measurement; fix Vetur errors

* Fix misaligned canvas in viewport until panning on page (re)load

* Add Vue bidirectional props documentation

* More folder renaming for better terminology; add some documentation

frontend/src/utility-functions/strip-indents.ts

@@ -0,0 +1,12 @@
+export function stripIndents(stringPieces: TemplateStringsArray, ...substitutions: unknown[]): string {
+	const interleavedSubstitutions = stringPieces.flatMap((stringPiece, index) => [stringPiece, substitutions[index] !== undefined ? substitutions[index] : ""]);
+	const stringLines = interleavedSubstitutions.join("").split("\n");
+
+	const visibleLineTabPrefixLengths = stringLines.map((line) => (line.match(/\S/) ? (line.match(/^(\t*)/) || [])[1].length : Infinity));
+	const commonTabPrefixLength = Math.min(...visibleLineTabPrefixLengths);
+
+	const linesWithoutCommonTabPrefix = stringLines.map((line) => line.substring(commonTabPrefixLength));
+	const multiLineString = linesWithoutCommonTabPrefix.join("\n");
+
+	return multiLineString.trim();
+}