Add 'download sources' command and add export options to config file

[frombetelgeuse]

No description provided.

[codecov]

Codecov Report

Merging #327 (bc05331) into cli3 (2a7d566) will decrease coverage by 0.72%.
The diff coverage is 55.83%.

@@             Coverage Diff              @@
##               cli3     #327      +/-   ##
============================================
- Coverage     62.93%   62.22%   -0.71%     
- Complexity      781      833      +52     
============================================
  Files           133      136       +3     
  Lines          3431     3774     +343     
  Branches        500      538      +38     
============================================
+ Hits           2159     2348     +189     
- Misses         1026     1164     +138     
- Partials        246      262      +16     

Impacted Files	Coverage Δ	Complexity Δ
...in/cli/commands/actions/DownloadSourcesAction.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...in/cli/commands/actions/DownloadTargetsAction.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...om/crowdin/cli/commands/functionality/FsFiles.java	3.04% <0.00%> (+0.18%)	1.00 <0.00> (ø)
.../cli/commands/functionality/ProjectFilesUtils.java	65.31% <0.00%> (-5.80%)	19.00 <0.00> (ø)
...in/cli/commands/picocli/ActCommandWithTargets.java	14.29% <0.00%> (-19.04%)	1.00 <0.00> (ø)
...li/commands/picocli/DownloadTargetsSubcommand.java	20.00% <0.00%> (-13.33%)	1.00 <0.00> (ø)
...n/cli/commands/picocli/StringDeleteSubcommand.java	80.00% <ø> (ø)	4.00 <0.00> (ø)
...din/cli/commands/picocli/StringEditSubcommand.java	70.00% <ø> (ø)	6.00 <0.00> (ø)
.../com/crowdin/cli/properties/ParamsWithTargets.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
.../com/crowdin/cli/properties/PropertiesBuilder.java	53.78% <ø> (ø)	23.00 <0.00> (ø)
... and 25 more

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