Bugfixes

[vkbo]

This PR addresses the following problems:

• The backup request dialog should pop up on any change to the project during the last session, not just on unsaved changes as it currently does.
• The regex that searches for words for the spell check highlighter was not including unicode characters, so it would underline parts of words using unicode characters even if the word was spellec correctly.
• When having unsaved changes in an open document, while changing editor configuration options, the document would be reloaded from disk when the changes were applied. This means the unsaved changes were lost. The document is now saved before the editor is re-initialised.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@6638c51). Click here to learn what that means.
The diff coverage is 90.47%.

@@            Coverage Diff            @@
##             master      #58   +/-   ##
=========================================
  Coverage          ?   66.77%           
=========================================
  Files             ?       36           
  Lines             ?     5781           
  Branches          ?        0           
=========================================
  Hits              ?     3860           
  Misses            ?     1921           
  Partials          ?        0

Impacted Files	Coverage Δ
nw/gui/configeditor.py	5.73% <0%> (ø)
nw/project/project.py	82.44% <100%> (ø)
nw/gui/dochighlight.py	93.38% <100%> (ø)
nw/gui/winmain.py	68.82% <50%> (ø)

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