Fixed a Crash concering the 'File Open' Method on Windows
- fixing double-free-bug
- interlaced-flag in Image
- disposualMethod in Gif
- userInputFlag in image
- fixing disposualMethod-settings
Merge branch 'GUI'

Conflicts:
	src/gui/mainWindow.cpp
Merge branch 'IO'

Conflicts:
	src/gui/mainWindow.cpp
	src/lzw/gif.cpp
	src/lzw/image.cpp
	src/lzw/io.cpp
After merge cleanup