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Fixed a bug related to default values in QtBaseViewerStereo, so stereo anaglyph mode works again now.

Added OpenFlipperQSettings which wraps the value() function to write an error message to console if that function is used without a default value. This is meant as a reminder to developers to properly initialize their settings and specify default values such that hopefully less bugs like the one above occur from now on.

Added default values for many calls to OpenFlipperSettings().value() - if you find any that I have overlooked, please add default values there, too!

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ViewControl now has a viewing direction toolbar with which the viewing cirection can quickly be set. Comes with six custom-made, awesome, axis-colored icons!

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Shaders can now be properly activated and deactivated again in the shaderWidget. Removed a lot of redundant/useless code from ViewControlPlugin shader handling and updated ShaderNode such that shaders may now also be disabled for a given drawMode.

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Avoid setting the default view mode each time the options widget has been quit via "Ok" or "Apply" button. Also avoid reset of toolboxes.

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- Ignoring whitespaces in filenames.
- Converting object names of groups to valid .obj-filenames (important for saving of settings file)

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