qcompilerdetection.h: add Q_COMPILER_UNIFORM_INIT

Up to now, the feature classe Uniform Initialization was subsumed by the
Q_COMPILER_INITIALIZER_LISTS flag together with support for
std::initializer_list.

This caused at least two problems:
1. On QNX, the standard libray does not ship <initializer_list>, even
   though the compiler (a GCC 4.6, IIRC) supports it. But since there
   was only one Q_COMPILER flag for both, support for the compiler-only
   part of the feature had to be disabled, too.
2. MSVC 2013 supports initializer lists, but has a bug that renders full
   uniform initialization support, as required for QUuid, useless.

By splitting the feature into two, we can separate them better, and do
so in QUuid, which is the only class that currently takes advantage of
uniform initialization (to provide constexpr constructors).

Since Q_COMPILER_INITIALIZER_LISTS worked as a flag for uniform
initialization so far, with the two known exceptions above,
UNIFORM_INIT is defined whenever INITIALIZER_LIST is, except that
I don't revert UNIFORM_INIT on QNX as I do for INITIALIZER_LISTS
and that I expect the MSVC 2013 features to set INITIALIZER_LIST,
but not UNIFORM_INIT.

Task-number: QTBUG-34705

Change-Id: I81916e950a0f3aab3de7977e0326d2de3d31b14c
Reviewed-by: Yuchen Deng <loaden@gmail.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
fix header bundling in some framework builds

!build_all is a sufficient condition for bundling headers in both debug
and release configurations, as it means that we will likely make only
one of the builds, and that needs to be self-contained.

Task-number: QTBUG-34575
Change-Id: I1a19e4b619eeff207cfbfd50d3b761053aeaa667
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Android: Support popup menus

This is used by QML comboboxes, menu buttons, etc.

Task-number: QTBUG-31420
Change-Id: I6d3f32fd80ce91c4be34eae636d1b95a4e251a49
Reviewed-by: BogDan Vatra <bogdan@kde.org>
Change platform selectors to match qmake selectors

Previously matched Qt.platform.os, however that can only provide one
string. Multiple selectors can be present at once, so we can provide
both unix and linux instead of having to pick the most specialized one.

Task-number: QTBUG-34796
Change-Id: I219517d740fa7385e923a9e09cb7e241378fbaee
Reviewed-by: David Faure <david.faure@kdab.com>
QNX: Fixed touch event positions

Touch positions reported by libscreen have to be adjusted relative to
the window position to be properly interpreted by Qt.

Task-number: QTBUG-34812
Change-Id: I68744dc9da95fb1d0d1704d12154fb24c148fe03
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>
Don't maximize dialogs.

Task-number: QTBUG-34765

Change-Id: Ia249e93dbbea11f3c03881c5fb88396bfad0e8fa
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>