BlackBerry: Implement the dark palette

This patch only implements the dark palette and returns it by default.

Change-Id: Ieab39c2d5c8f35b9479719b78843b13355c5f123
Reviewed-by: Kevin Krammer <kevin.krammer@kdab.com>
Reviewed-by: Rafael Roquetto <rafael.roquetto@kdab.com>
Blackberry: Change name from QQnxTheme to QBlackberryTheme

Change-Id: Ia30a18c988986f8c20bc4e4475c5e24b06493035
Reviewed-by: Kevin Krammer <kevin.krammer@kdab.com>
Reviewed-by: Rafael Roquetto <rafael.roquetto@kdab.com>
Remove usage of QT_NO_SHAPE

First of all QT_NO_SHAPE was never set in configure script, which
means that !contains(DEFINES, QT_NO_SHAPE):LIBS += -lxcb-shape always
was true and we were linking to -lxcb-shape no matter what.

Secondly, we are providing shape.c in qtbase/src/3rdparty/xcb/libxcb, so
users always have an -qt-xcb option available to get this extension.

Change-Id: I7d14a0ac5ca6e36fb9c053225916cae41028b532
Reviewed-by: Uli Schlachter <psychon@znc.in>
Reviewed-by: Jørgen Lind <jorgen.lind@digia.com>
Remove unused QMakeVar QT_NO_XCB

Grepping in Qt source code for QT_NO_XCB didn't find any
references to this variable.

Change-Id: Iabe5679f8b066facede2ac3bfc8c14ec4c0473a2
Reviewed-by: Jørgen Lind <jorgen.lind@digia.com>