QLR sharing file feature

[sumandari]

Please see #212

• CRUD
• validation
• parse url dataresource from .qlr
• parse provider from .qlr
• find out the license applied for the uploaded .qlr : free text license
• add unit test for validation
• add unit test for view
• create license.txt file from license field in model
• update download zipfile to include custom license.txt created

[sumandari]

[codecov-commenter]

Codecov Report

Merging #219 (a313222) into master (4f9990d) will increase coverage by 0.25%.
The diff coverage is 40.74%.

@@            Coverage Diff             @@
##           master     #219      +/-   ##
==========================================
+ Coverage   37.27%   37.53%   +0.25%     
==========================================
  Files          77       83       +6     
  Lines        3364     3634     +270     
==========================================
+ Hits         1254     1364     +110     
- Misses       2110     2270     +160     

Impacted Files	Coverage Δ
qgis-app/settings_docker.py	100.00% <ø> (ø)
qgis-app/layerdefinitions/file_handler.py	21.05% <21.05%> (ø)
qgis-app/layerdefinitions/tests/test_views.py	27.90% <27.90%> (ø)
qgis-app/base/views/processing_view.py	31.09% <40.00%> (+0.32%)	⬆️
...is-app/layerdefinitions/tests/test_file_handler.py	42.85% <42.85%> (ø)
qgis-app/layerdefinitions/models.py	86.36% <86.36%> (ø)
qgis-app/layerdefinitions/admin.py	100.00% <100.00%> (ø)
...is-app/layerdefinitions/migrations/0001_initial.py	100.00% <100.00%> (ø)

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[sumandari]

Review page:

Detail page

[sumandari]

Update menu and tiltle (#220), add url_metadata field and update license to not use cc0 rather the License of the resource itself

License from downloaded file is generated from license field value.

[timlinux]

LGTM thanks!