Generalize plugin compilers

[saberzero1]

Goal

Provide a framework/base class to more easily integrate plugins that render content inside notes.

Examples:

• Dataview
• Datacore
• TTRPG statblocks
• Leaflet
• Multi-column layout
• Dice rollers
• Enhanced embeds

Prerequisites

• Caching. Because every enabled plugin will incure a performance hit.
• Ways to easily call rendering from arbitrary plugins.
• Ways to include assets (JS script with dice rollers or Leaflet, CSS with Multi-column, etc.)

Ideas

• Class that checks for plugin. (Enabled, render function, settings, assets to include, etc.)