FILES: Path rework & typesafety (#479)

* Added new types for various file paths, all in the Paths folder.
* TypeSafety and other helper functions related to these types
* Added basic globbing support with * and ?. Currently only implemented for Script/Text, on nano and download terminal commands
* Enforcing the new types throughout the codebase, plus whatever rewrites happened along the way
* Server.textFiles is now a map
* TextFile no longer uses a fn property, now it is filename
* Added a shared ContentFile interface for shared functionality between TextFile and Script.
* related to ContentFile change above, the player is now allowed to move a text file to a script file and vice versa.
* File paths no longer conditionally start with slashes, and all directory names other than root have ending slashes. The player is still able to provide paths starting with / but this now indicates that the player is specifying an absolute path instead of one relative to root.
* Singularized the MessageFilename and LiteratureName enums
* Because they now only accept correct types, server.writeToXFile functions now always succeed (the only reasons they could fail before were invalid filepath).
* Fix several issues with tab completion, which included pretty much a complete rewrite
* Changed the autocomplete display options so there's less chance it clips outside the display area.
* Turned CompletedProgramName into an enum.
* Got rid of programsMetadata, and programs and DarkWebItems are now initialized immediately instead of relying on initializers called from the engine.
* For any executable (program, cct, or script file) pathing can be used directly to execute without using the run command (previously the command had to start with ./ and it wasn't actually using pathing).

src/Paths/TextFilePath.ts

@@ -0,0 +1,17 @@
+import { Directory } from "./Directory";
+import { FilePath, resolveFilePath } from "./FilePath";
+
+/** Filepath with the additional constraint of having a .js extension */
+type WithTextExtension = string & { __fileType: "Text" };
+export type TextFilePath = FilePath & WithTextExtension;
+
+/** Check extension only */
+export function hasTextExtension(path: string): path is WithTextExtension {
+  return path.endsWith(".txt");
+}
+
+/** Sanitize a player input, resolve any relative paths, and for imports add the correct extension if missing */
+export function resolveTextFilePath(path: string, base = "" as FilePath | Directory): TextFilePath | null {
+  const result = resolveFilePath(path, base);
+  return result && hasTextExtension(result) ? result : null;
+}