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Krita Gemini does not have a KoApplication object, so don't assume it
is there.

And use KoFileDialogHelper everywhere in Krita

BUG:330336

CCBUG:328906

This contains:

commit 8d1a936def6afb25afcc442624dd83d9b4cdfc25
Author: Boudewijn Rempt <boud@valdyas.org>
Date:   Wed Dec 18 14:03:46 2013 +0100

    BUG:328906 Fix scaling of file layer

commit 0ff91ca0e8ef23370723bf976a882a18cb42e97c
Author: Boudewijn Rempt <boud@valdyas.org>
Date:   Wed Dec 18 13:48:30 2013 +0100

    Fix crash on loading a file layer

    CCBUG:328906

commit de1b6cccfe1dfb9fa624fc5e37f277cbb8ac08c2
Author: Boudewijn Rempt <boud@valdyas.org>
Date:   Wed Dec 18 12:45:54 2013 +0100

    BUG:328906 Fix scaling method labels for file layer dialog

This merges the first part of the mvc refactoring: it makes
Calligra use xmlgui directly instead of kparts. We weren't
using kparts for what they were intended for, that is, embedding
a combined document/view object into some container.

Now KoPart is factory for views and mainwindows. KoDocument handles
all loading/saving internally.

Next up: make KoPart and KoMainWindow manage multiple views and
documents.

REVIEW:111545

Conflicts:
	krita/ui/kis_view2.cpp
	krita/ui/widgets/kis_workspace_chooser.cpp
	libs/main/CMakeLists.txt
	libs/main/KoDocument.h
	libs/main/KoMainWindow.cpp
	libs/main/KoMainWindow.h

This time without breaking group layers

This reverts commit bde7ee3418fcb91232bcb5a220abbcbc66d78780.

BUG:321474

This is a layer that is loaded from a file and updates when the file
changes. Optionally, the image in the file can be scaled to the current
image's resolution.