Customizable Markdown Templates

[Russman12]

This is a working example of a complex custom templating functionality. To run this, run the following commands cd examples/custom-templates, npm install, npx ts-node exec.ts.

The following files are key to the functionality:

• src/engine.ts: this is the singleton instance which hold all static details such as directory configs, cached templates, the complete view data, etc.
• src/renderer.ts: this contains logic for how files are rendered and calls resources from the engine.
• src/bundles/bundle.ts: abstract class which contains functionality common to all bundles, eg all bundles must contain some array of bundles, and have a "renderAll" function.
• src/bundles/default/default.ts: this class is a bundle definition. It contains all renderers and helper functions for the templates it produces. There should be a subdirectory which contains the templates for the bundle as well, but I ran into a speed bump making that work in conjunction with a configured directory.

#286