[Core] More visible active lines for QML ActionButton.
[Azoth Vader] Fixed compatibility with crappy clients.

Some clients like Pidgin or official Mail.Ru client don't know
anything about BOM and display a question mark or something like
that instead. This removes the BOM from the messages.

Fixes #1210.
[Azoth Vader] Fix encoding for microblog music status.
[Azoth] Pass the line edit to the KeyboardRosterFixer for #1213.
[Azoth] Cancel search on Esc as well.
[Azoth] Cancel search if current text is empty for #1213.