Optional proxy support

[tobiasKaminsky]

No description provided.

[codecov]

Codecov Report

Merging #1296 (ed64625) into master (5790108) will increase coverage by 0.03%.
Report is 2 commits behind head on master.
The diff coverage is 56.25%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1296      +/-   ##
============================================
+ Coverage     50.94%   50.97%   +0.03%     
- Complexity      976      978       +2     
============================================
  Files           198      198              
  Lines          7269     7288      +19     
  Branches        944      945       +1     
============================================
+ Hits           3703     3715      +12     
- Misses         3056     3062       +6     
- Partials        510      511       +1     

Files	Coverage Δ
.../main/java/com/nextcloud/common/NextcloudClient.kt	50.61% <70.00%> (+2.00%)	⬆️
.../src/main/java/com/nextcloud/common/PlainClient.kt	67.85% <57.14%> (-3.58%)	⬇️
...om/owncloud/android/lib/common/OwnCloudClient.java	43.52% <42.85%> (+0.10%)	⬆️
...droid/lib/common/OwnCloudClientManagerFactory.java	68.75% <50.00%> (-18.75%)	⬇️