Josef Schneiders Krautchan plugin

Thanks to Josef Schneider there is a plugin for the krautchan.net site.
I just modified the code to compile with Qt 4.x and Qt 5.x.
Local commit before working on new thumbnail creator
Rewrote the thumbnail creation process

* No more warnings
* No more crashes (hopefully)
* Correct use of threads
Coding ThumbnailRemover correctly
4chan spoilered images
* are now downloaded (again)
* since the original filenames are not available for these the 4chan
filename is used
* Incrementing plugin version to 1.6
Qt5 update (taskbar progress not working yet on Win Vista+)
json files with plugin data
Merge branch 'master' of github.com:J0s3f/fourchan-dl

Conflicts:
	plugins/parserKrautchan/parserKrautchan.cpp
	plugins/parserKrautchan/parserKrautchan.h
	plugins/plugins.pro