Easier plugin management

[krusynth]

The RPG Maker MV ecosystem lacks a coherent plugin repository system. Since this is a javascript application, npm is the logical choice for management. As I did with Minecraft, it would be useful to create a management system for plugins. Some considerations:

• RPG Maker's plugins do not follow the standard NPM module format.
• Authors generally do not post their plugins to a central repository that's indexed.
• We probably don't want to rehost those due to licensing concerns.
• We will likely want to generate a "credits" file of some sort

Some potential solutions:

• Host an index of plugins - easily done on GitHub pages, but keeping this up and versioning becomes difficult quickly.
• Create a plugin to NPM itself to handle a unique repo & structure.

[krusynth]

napa looks like a potential solution. We'll still need a wrapper to handle the various authors' files.