[LMP Graffiti] Set / as root path for watcher.

Probably finally fixes #1517.
[Util] Avoid leaking futures in ItemFinder.

Saves around 5-10 meg per rescan.
[Azoth Murm] Fix a segfault on slow sends.

Message can be deleted by the time we get a confirmation about it.
[Azoth Murm] Don't go offline on reauthing.
[Azoth Murm] Restart the poller on reauthing.
[LMP Graffiti] Properly handle Unicode in CUEs, fixes #1518.
[CL] Added CpuLoad plugin stubs.
[Tools] Updated years in genplugin.py.
[Core] Updated Magog's and mine years in About dlg.
[Core] Proper Mellon's contribution years.
[Core] Compact ranges in About dialog.
[Core] Const-qualification sucked with gcc.
[Interfaces] Slight docs fixes.
[Interfaces] Better ITagsManager docs.
[Azoth] Added AzothUtil docs.
Merge branch 'master' of github.com:0xd34df00d/leechcraft
[Interfaces] Added IDataFilterCallback_f.
[Imgaste] A little bit cleaner code.
[Imgaste] Support IDataFilter callbacks.
[Interfaces] Clarified IDataFilter docs.