Break This Up Into 3 Plugins

[chadhietala]

This is getting pretty unwieldy. Should be broken up into the following:

['debug-macros', {
   debug: boolean,
   source: string,
   externalizeHelpers: { module: true, global: string }
],
['feature-flags', { debug: boolean, flags: Object, source: string }]
['svelte', { flags: Object, debug: boolean, source: string }]

Likely need to check if there are other options that each plugin needs.

[chadhietala]

We have a monopoly on all of these names on npm

[rwjblue]

👍 - also, we can still have the group of plugins exist as a preset if we want...