Download and pull project to temp dir

[JanCaha]

First download project of project should utilize system temp directory instead of .mergin to avoid issues with other sync tools.

Fixes also part of pull that was not yet handled correctly.

Fixes #183

This fixes download part of #183 and complements work in #253

[coveralls]

Pull Request Test Coverage Report for Build 17380267703

Details

• 17 of 17 (100.0%) changed or added relevant lines in 3 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.02%) to 80.423%

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Files with Coverage Reduction	New Missed Lines	%
mergin/client_pull.py	1	84.19%

Totals
Change from base Build 16775335899:	-0.02%
Covered Lines:	3500
Relevant Lines:	4352

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💛 - Coveralls

[MarcelGeo]

@RastoHu

Best way to test this will be to copy existing project to directory which is syncing with One Drive.

• make some changesin qgis to geopackages in different folder -> sync
• pull changes in plugin to your OneDrive synced directory
• you will not see any errors by download / pull of projects.

[JanCaha]

Everything should be fixed here.

[wonder-sk]

Can we make the temporary directory naming more consistent? It is tmp_dir or temp_dir or temp_directory - let's pick just one 🙂
(I think Marcel would prefer tmp_dir so that we don't get new conflicts in his "push v2" branch)

[MarcelGeo]

Will bemerged after testing by @RastoHu will be done.

[RastoHu]

@JanCaha @MarcelGeo
On which version (build) of the plugin should I test it?

[JanCaha]

Should not really matter. This background stuff for plugin so it should work with any version

[MarcelGeo]

Tests passed.