Separate editors into plugin files

[chemicalcain]

FeatherWiki has the ability to switch between a rich text editor and a Markdown editor in its core source. This seems unnecessarily bulky to me, since extra code is needed to parse the rich text into the saved text. Markdown seems to largely be saved as markdown, but rich text is saved as html, which takes many more characters. If lightweight is the goal, then here's my recommendation:

• Main default editor should be Markdown/HTML
• Plugin for rich text editor should be available
• Plugin for Markdown/HTML preview window should be available

This would shrink the core of FeatherWiki and allow users more flexibility.

[chemicalcain]

Image upload will need to be managed elsewhere if rich text is to be removed. See #3