Add filtering for the Tag Editor
Tag Editor - Only convert the filter text once
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Remove & from dock window titles as they are not always converted to underscores for some reason
Use unicode() instead of str() when filtering the tags
Fix non breaking spaces being stripped out during save
Workaround Qt replacing nbsp with normal scape on copy
Added callback method: sanitize_callback

This callback enables change sanitize behavior.
Filename sanitization when sending to the device is not necessary for some devices.
Official plugin should never override this callback this callback to pass the
sanitization, but this is useful to override by the private driver plugin.
Start work on the check book tool
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Shortcuts to move through the error list and open error in editor on Enter
Nicer painting of error list
Use a splitter for the check book window
Automatic fixing of errors
Checks for raster images
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Auto-fixing of individual errors
Handle check items being activated that are not editable
Check all links in the book