Improvements

[vkbo]

A bunch of little improvements to the GUI and code

Status Bar

• Redesign of the status bar adding project and session stats as well as a session timer.
• Project word count is written to the project file, which is needed for the session word count.
• Closing a project now clears the status bar.

Editor

• Spell checker now ignores lines staring with @ and words in all uppercase.
• A document can be closed, which also clears it from last edited document in the project file. I.e. it is not re-opened on next start.
• Tab width is now by default 40 pixels, and can be set in the config.

Bugfixes

• Closing the application with the window X button, and selecting No on the dialog, still closed the application. Properly handled the close event now so that the closing is cancelled.

[codecov-io]

Codecov Report

Merging #21 into master will increase coverage by 0.36%.
The diff coverage is 85.92%.

@@            Coverage Diff             @@
##           master      #21      +/-   ##
==========================================
+ Coverage   80.68%   81.04%   +0.36%     
==========================================
  Files          23       23              
  Lines        3215     3313      +98     
==========================================
+ Hits         2594     2685      +91     
- Misses        621      628       +7

Impacted Files	Coverage Δ
nw/gui/dochighlight.py	100% <100%> (ø)	⬆️
nw/gui/doceditor.py	66.78% <100%> (+0.59%)	⬆️
nw/gui/mainmenu.py	96.23% <100%> (+0.06%)	⬆️
nw/constants.py	100% <100%> (ø)	⬆️
nw/gui/winmain.py	69.47% <41.5%> (-1.46%)	⬇️
nw/gui/doctree.py	45.93% <91.66%> (+1.71%)	⬆️
nw/config.py	94.71% <96.38%> (-0.58%)	⬇️
nw/gui/statusbar.py	97.24% <96.96%> (+2.08%)	⬆️
nw/project/project.py	79.15% <97.36%> (+1.3%)	⬆️
... and 1 more

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