Improved fixes for issue 259 with new icon for clear frame button
Moved MinimizeButton to separate file

Signed-off-by: Marius Avram <marius.avram1309@gmail.com>
Fix SEGFAULT when watch_file_changes is false

I haven't seen any bug with this, but at least on my machine
I can't open any project file when watch_file_changes is false,
because i get a SEGFAULT. This fixes the issue.
Merge pull request #395 from marius-avram/watch-file-segfault

Fix SEGFAULT when watch_file_changes is false
Hided scroll bars on RGBA-label QTextEdit-widget.
Related to issue https://github.com/appleseedhq/appleseed/issues/364
Merge pull request #394 from marius-avram/B331-refactor

Moved MinimizeButton to separate file
Merge pull request #396 from liiza/bugfixing

Hide scrollbars on RGBA QTextEdit widget.
small code tweak.
minor cosmetic fixes for issue 259
minor code tweaks.
Merge pull request #393 from sriravic/issue259imp

Improved fixes for issue 259 with new icon for clear frame button