Add MinGW-builds gcc 4.8.2 as Tier 2 platform

Since we now ship an installer with it it certainly qualifies
as Tier 2 (if not even Tier 1...)

This change does not apply to Qt 5.

Change-Id: I2cb5068867e46a42fb52c7cfdb365aa99937bb04
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Ensure correct codec is used for Sources and Forms view.

6626e5f41712723405c110a4f11ad650116f7523 did it on the wrong line.

This problem does not exist in Qt 5.

Change-Id: Ia39bc69b3f5ad58d28994ef3cae00242a8d0adbb
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Titta Heikkala <titta.heikkala@digia.com>
fix PlatformToolSet tag location in vcxproj files

The PlatformToolSet tag belongs into the PropertyGroup with the label
"Configuration". The former location in an anonymous PropertyGroup
tricked Visual Studio into displaying the right PlatformToolSet but
using its default value. If VS 2010 and VS 2012 are freshly installed
on the same machine, the default toolset for VS 2012 is VS 2010.

Task-number: QTBUG-30822

Change-Id: If00a532e92b0812c552b1cac52ff77a1e7039146
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
(cherry picked from commit 853a0b764e08d5f910072b6f3fd3ff3f9dc5c0c4)