Refactors configuration management (#4271)

* Adds flow types / Configuration interfaces

* Lets call it options

* Use a single interface to generate the configurations

* Translates options to definitions only if comments are set

* improves logic

* Moves objects around

* Fixes issue affecting logging of circular objects

* fixes undefined env

* Moves all defaults to defaults

* Adds back CLI defaults

* Restored defaults in commander.js

* Merge provided defaults and platform defaults

* Addresses visual nits

* Improves Config.js code

* Adds ability to pass the default value in trailing comments

* Load platform defaults from the definitions file

* proper default values on various options

* Adds ParseServer.start and server.start(options) as quick startup methods

* Moves creating liveQueryServer http into ParseServer.js

* removes dead code

* Adds tests to guarantee we can start a LQ Server from main module

* Fixes incorrect code regading liveQuery init port

* Start a http server for LQ if port is specified

* ensure we dont fail if config.port is not set

* Specify port

* ignore other path skipped in tests

* Adds test for custom middleware setting

* Refactors new Config into Config.get

- Hides AppCache from ParseServer.js, use Config.put which validates

* Extracts controller creation into Controllers/index.js

- This makes the ParseServer init way simpler

* Move serverURL inference into ParseServer

* review nits

spec/ParseRole.spec.js

@@ -116,7 +116,7 @@ describe('Parse Role testing', () => {
 
       return Parse.Object.saveAll(roles, { useMasterKey: true });
     }).then(() => {
-      auth = new Auth({config: new Config("test"), isMaster: true, user: user});
+      auth = new Auth({config: Config.get("test"), isMaster: true, user: user});
       getAllRolesSpy = spyOn(auth, "_getAllRolesNamesForRoleIds").and.callThrough();
 
       return auth._loadRoles();
@@ -159,7 +159,7 @@ describe('Parse Role testing', () => {
         return createRole(rolesNames[2], anotherRole, null);
       }).then((lastRole) => {
         roleIds[lastRole.get("name")] = lastRole.id;
-        var auth = new Auth({ config: new Config("test"), isMaster: true, user: user });
+        var auth = new Auth({ config: Config.get("test"), isMaster: true, user: user });
         return auth._loadRoles();
       })
     }).then((roles) => {
@@ -222,7 +222,7 @@ describe('Parse Role testing', () => {
       superContentManager.getRoles().add(superModerator);
       return Parse.Object.saveAll([admin, moderator, contentManager, superModerator, superContentManager], {useMasterKey: true});
     }).then(() => {
-      var auth = new Auth({ config: new Config("test"), isMaster: true });
+      var auth = new Auth({ config: Config.get("test"), isMaster: true });
       // For each role, fetch their sibling, what they inherit
       // return with result and roleId for later comparison
       const promises = [admin, moderator, contentManager, superModerator].map((role) => {