[FEATURE] autoload for plugins & refactoring of core plugins

a plugin has now a namespace, e.g.:

Phile\Plugin\PhileParserMarkdown

this namespace is used to autoload classes.

example:
Namespace: Phile\Plugin\PhileParserMarkdown\Parser\Markdown
File: plugins/phileParserMarkdown/Classes/Parser/Markdown.php

Releases: 0.9.3