Add StatDir and replace com.StatDir

[lunny]

As title.

[6543]

🚀

[codecov-io]

Codecov Report

Merging #14099 (06349c7) into master (addd424) will decrease coverage by 0.00%.
The diff coverage is 40.38%.

@@            Coverage Diff             @@
##           master   #14099      +/-   ##
==========================================
- Coverage   42.34%   42.33%   -0.01%     
==========================================
  Files         726      726              
  Lines       77741    77788      +47     
==========================================
+ Hits        32918    32931      +13     
- Misses      39421    39446      +25     
- Partials     5402     5411       +9     

Impacted Files	Coverage Δ
models/repo.go	51.89% <0.00%> (ø)
modules/util/path.go	55.69% <40.42%> (-22.43%)	⬇️
modules/options/dynamic.go	60.78% <50.00%> (ø)
modules/templates/dynamic.go	56.14% <50.00%> (ø)
modules/util/timer.go	42.85% <0.00%> (-42.86%)	⬇️
models/unit.go	46.57% <0.00%> (-2.74%)	⬇️
modules/queue/unique_queue_disk_channel.go	53.84% <0.00%> (-1.54%)	⬇️
models/gpg_key.go	53.33% <0.00%> (-0.58%)	⬇️
services/pull/pull.go	42.35% <0.00%> (-0.51%)	⬇️
modules/charset/charset.go	73.03% <0.00%> (+4.49%)	⬆️
... and 1 more

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