MessageView does not currently load external resources (QTextBrowser by
default interprets all external resources as local file names and tries
to load them like that. This can, in the future, be implemented. For
example, if SOCKS (Tor) is used, the resource could be loaded through
the SOCKS too.
This commit is a skeleton for it that does not actually do anything and
can be filled with an implementation that does the loading.
Email addresses and URIs are now clickable when viewing a message in
plain text mode. Clicking an email address moves to the Send tab, while
clicking an URI has the same result as clicking an URI in html mode, it
will ask for confirmation before opening it in external handler.
HTML parser wasn't correctly handling img tags.
Now it also by defaults disabled external schemas to prevent
deanonymisation (even though the renderer actually doesn't support
external schemas at the moment)
Addresses #178
Zooming in message body view / compose works in single steps
irrespective of wheel sensitivity, and info about zoom level is
displayed in percent rather than font pixel size.
Message will render as user is scrolling down. This prevents interface
freezes on long messages (such as inline img in text mode). Fixes
Bitmessage##366
Also a minor fix in text mode rendering.
