Improvements

[vkbo]

Some minor improvements to the GUI:

• Pressing F2 also opens the edit item dialog, like Ctrl+E does.
• When the document editor and viewer split slider is moved, the editor resizes properly.
• The document viewer can be closed, expanding the editor to the full window size again.
• A project can be closed with Ctrl+Shift+W, and the menu entry has an icon.
• Exit button/menu now asks if you want to close.

[codecov-io]

Codecov Report

Merging #19 into master will increase coverage by 0.39%.
The diff coverage is 91.66%.

@@            Coverage Diff             @@
##           master      #19      +/-   ##
==========================================
+ Coverage   80.29%   80.68%   +0.39%     
==========================================
  Files          23       23              
  Lines        3197     3215      +18     
==========================================
+ Hits         2567     2594      +27     
+ Misses        630      621       -9

Impacted Files	Coverage Δ
nw/gui/statusbar.py	95.16% <ø> (-0.08%)	⬇️
nw/gui/docdetails.py	97.87% <ø> (-0.09%)	⬇️
nw/gui/doctree.py	44.21% <100%> (-0.17%)	⬇️
nw/gui/doceditor.py	66.18% <100%> (+0.35%)	⬆️
nw/gui/mainmenu.py	96.16% <90%> (+0.42%)	⬆️
nw/gui/winmain.py	70.93% <91.66%> (+3.06%)	⬆️

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