Revert "Add h2o submodule"

This reverts commit fbf7773755ccb976ffd69cb667746e40813dc523.
Add twig submodule
Convert maps templating to twig
Templatify streams
Clean up code a bit
Templatify news, split up stream template
Markdownify templatified texts
Templatify index.php
Some refinements and small fixes
Put sentences in paragraphs
Templatify most of the forums + some minor fixes
Templatify thread adding
Templatify forum editing + fix a redirect issue
Templatify registering + fixes + improvements
Templatify search + separate scoped CSS
Fix forum categories not correctly displaying
Merge branch 'templating' into dev

Conflicts:
	.gitmodules
	inc/classes/map.class.php
	inc/maps.php
	inc/templates/maps.html