Fix windows network share URIs in paquo

[ap--]

Provides better URI handling by trying to normalise all file:// URIs to a supported 4-slash version.

Closes #65

See also:

• https://github.com/qupath/qupath/pull/1134
• https://github.com/qupath/qupath/pull/1049
• https://en.wikipedia.org/wiki/File_URI_scheme#Windows
• https://en.wikipedia.org/wiki/File_URI_scheme#How_many_slashes

With PR 1134 merged in QuPath all of this logic might be removed for QuPath-0.4.x support.

[codecov-commenter]

Codecov Report

Merging #80 (3662111) into main (7442f0d) will increase coverage by 0.00%. The diff coverage is 92.59%.

@@           Coverage Diff           @@
##             main      #80   +/-   ##
=======================================
  Coverage   89.16%   89.17%           
=======================================
  Files          27       27           
  Lines        3499     3547   +48     
=======================================
+ Hits         3120     3163   +43     
- Misses        379      384    +5     

Impacted Files	Coverage Δ
paquo/jpype_backend.py	87.87% <ø> (ø)
paquo/projects.py	95.75% <ø> (ø)
paquo/images.py	97.86% <88.23%> (-1.12%)	:arrow_down:
paquo/tests/conftest.py	100.00% <100.00%> (ø)
paquo/tests/test_projects.py	100.00% <100.00%> (ø)

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[ap--]

Merging now to start work on #81