Improve palette for nicknames coloring in group chats

Patch from Psi+ project.
Merge pull request #87 from tehnick/muc-nicks-coloring

Improve palette for nicknames coloring in group chats
fix IconAction::setParent

In IconAction constructor action will be added to parent QWidget
(if set). setParent function must implement such behavour too.
Merge pull request #88 from drizt/upstream

fix IconAction::setParent
fixed webkit dpi

Workaround.  WebKit works only with 96dpi.
Need to convert point size to pixel size.
Merge pull request #91 from drizt/webkit-dpi

fixed webkit dpi
Added hack to make bringToFront working properly in kde
Merge branch 'master' of github.com:psi-im/psi
Slightly rewritten previous KDE hack to be more accurate.
Removed file suffix in KDE hack (should work in KDE for windows =) )
fixed typo
Merge pull request #92 from liuch/master

fixed typo
Fixed contacts tooltips colors

KDE uses tooltip color roles to render background, but psitiplabel had some other default roles.
So we had a mess mixing tooltip and not tooltip roles
Remove line-height from new_classic webkit theme.
Use lookahead when parsing _/*
Fixed crash in AlertManager (double free)
Allow no text in html message content. for example if it's image