Custom Web Components - Githubissues

This adds two custom web components:

dd-incrementer (closes #161 )
- A form-associated number input
- The user can type into it to change the value, or use the buttons to increase/decrease the value.
- The buttons support both Click and Ctrl+Click, using Ctrl+Click increases the value by a step size larger than Click.
dd-icon (closes #123 )
- Retrieves an icon from the server asynchronously when it is put into the DOM
- Allows using dotdungeon/assets icons without the full path, or loading anything with the full path

Both components support devMode-only HMR that reloads CSS and for dd-icon the icon SVG as well.

Oliver-Akins / foundry.dungeon