In order to prepare OMM for use with the new Open MCT build system, we need to refactor loader.js to remove all calls to builtin Open MCT plugins and keep it focused on MCWS plugins.

Instead, builtin plugins should be configured via a new recipe for Open MCT for MCWS.

In fact, let's remove loader.js entirely, and just install all of the MCWS plugins in AMMOSPlugins.js, which will be the entry point for the Open MCT for MCWS plugin.

This is also a good opportunity to refactor AMMOSPlugins.js to use ES6 imports instead of require/common/whateverjs.