Import Text File

[vkbo]

This partially addresses request #63

This change makes it possible to fill an open document file with content loaded from a text file. The option is accessible from the menu under Document > Import from File, or by pressing Ctrl+Shift+I. This will open a file dialog box allowing the user to select a text file to import. A document in the editor must be open beforehand, and the content will be replaced. A dialog box will check that it is OK to replace the text in the case the document is not empty.

Trying to load a binary file will cause an error. The file read must be readable by Python3 as a text file. and convertible to plain text.

[codecov-io]

Codecov Report

Merging #65 into master will decrease coverage by 0.31%.
The diff coverage is 28.81%.

@@            Coverage Diff             @@
##           master      #65      +/-   ##
==========================================
- Coverage   65.74%   65.42%   -0.32%     
==========================================
  Files          38       38              
  Lines        6078     6132      +54     
==========================================
+ Hits         3996     4012      +16     
- Misses       2082     2120      +38

Impacted Files	Coverage Δ
nw/constants.py	100% <ø> (ø)	⬆️
nw/gui/doctree.py	50.26% <0%> (-1.11%)	⬇️
nw/gui/itemeditor.py	95.87% <100%> (ø)	⬆️
nw/gui/mainmenu.py	93.86% <100%> (+0.09%)	⬆️
nw/gui/winmain.py	64.83% <3.44%> (-3.57%)	⬇️
nw/gui/doceditor.py	61.96% <50%> (-0.07%)	⬇️
nw/config.py	95.18% <88.88%> (-0.22%)	⬇️

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