Now handle all files instead of just first one.

Add a loop. Use let instead of var to keep variables within scope of loop,
preventing them from being reset on next iteration.
Do not url_decode $content on new_post and do not remove sidebar.

Still trying to get it to not mess up imgs with data-uri for src. It's url_decoding
them.
Updated style, mostly for forms. Removed tag search from sidebar.

Use Icons in certain labels instead of text and blend it in with its input.