Introduce midori_web_settings_get_system_name helper.
Add version numbers for libunique and libnotify if available.
Show platform and architecture if possible.
Merge debug string into the full version number.
Render video formats as a one-liner.
The new Automatic user agent is meant to pick the string
that websites most likely check for. Right now this is
Safari. Quirks built-in to WebKit are also used.
The separate Midori identification has no quirks.
Fixes: https://bugs.launchpad.net/midori/+bug/865503
The new function allows registering callbacks which clear data,
with a name and label so they show up in the Clear Private Data
dialogue and the chosen items are saved.
The old enumeration still keeps history, trash and the flag
whether to clear when Midori quits.
Each view has a meta value 'delay' which indicates whether it be
loaded or needs to be loaded manually before it shows content.
One way to trigger this is that Midori crashes and if it is
configured to 'Show last open tabs', all tabs will now be
delayed. To allow Midori to safely open without crashing again.
The other way is to change the 'Load on Startup' preference to
'Show last tabs without loading'. This causes all tabs restored
from the session to be delayed.
One interesting aspect is that it is possible to have delayed
tabs, use 'Show last open tabs' and tabs will remain as they are,
so delayed tabs will be delayed over following sessions.
