Flatten lib namespace

Move all functions and classes currently available through lib/name and
libName to be under a single flat namespace in lib.  This make
reorganising the lib namespace much simpler as the location of symbols
can move without breaking the consumers of lib.

The multi-entrypoint design was already problematic for the web plugin
system which couldn't effectively use it due to how webpack's shared
module system is awkward to set up with multiple entrypoints per package.

test/integration/export.js

@@ -2,17 +2,17 @@
 const assert = require("assert").strict;
 const path = require("path");
 
-const libFactorio = require("@clusterio/lib/factorio");
+const lib = require("@clusterio/lib");
 
 
 describe("Integration of lib/factorio/export", function() {
 	describe("exportLocale()", function() {
 		it("returns a nested Map with base game locale information", async function() {
 			let writePath = path.join("temp", "test", "server");
-			let testServer = new libFactorio.FactorioServer("factorio", writePath, {});
+			let testServer = new lib.FactorioServer("factorio", writePath, {});
 			await testServer.init();
 
-			let locale = await libFactorio._exportLocale(testServer, new Map(), ["base"], "en");
+			let locale = await lib._exportLocale(testServer, new Map(), ["base"], "en");
 
 			assert(locale instanceof Map, "locale is not a map");
 			assert.equal(locale.get("entity-name.fish"), "Fish");