refactor(lib): change package structure to allow for entrypoints

* Add entrypoints for `core`, `flex`, and `extended`.
  >  All entrypoints have a module that can be imported separately
* Remove the BiDi clone from the CDK and add a direct/peer dependency
* Rename `ServerStylesheet` to `StylesheetMap`

Fixes PR #631.

Author: CaerusKaru

build-config.js

@@ -15,6 +15,12 @@ const buildVersion = package.version;
  */
 const angularVersion = '^5.0.0';
 
+/**
+ * Required Angular CDK version for all Angular Layout packages. This version will be used
+ * as the peer dependency version for Angular CDK in all release packages.
+ */
+const cdkVersion = '^5.0.0';
+
 /** License that will be placed inside of all created bundles. */
 const buildLicense = `/**
  * @license
@@ -27,6 +33,7 @@ const buildLicense = `/**
 module.exports = {
   projectVersion: buildVersion,
   angularVersion: angularVersion,
+  cdkVersion: cdkVersion,
   projectDir: __dirname,
   packagesDir: join(__dirname, 'src'),
   outputDir: join(__dirname, 'dist'),

docs/documentation/BreakPoints.md

@@ -19,7 +19,7 @@ export const BreakPointsProvider = {
  // ObservableMediaProvider  // easy subscription injectable `media$` matchMedia observable
   ]
 })
-export class MediaQueriesModule {
+export class CoreModule {
 }
 ```