This is required in order to get the theme config keys of the various apps into
themes.config; this way, the routerconsole requires no knowledge of what apps
support universal theming, and can just blanket apply themes to all known keys.

FIXME: ensure that _theme is only read from the config file once per page load.

Before iframing i2ptunnel, clicking the Preview button would open the site in the parent
window. This change will cause the sites to open in the parent window from
within the iframed page.

Directory column could do with a different icon.

The header icons are self-explanatory (but tooltip also has header text); the
status text is available from the tooltip.

This stops app icons getting "stuck" on the right-hand side of /home

   Icon created and contributed by colombo-bt.i2p