Allow to exclude sub-directories

[lorenzwalthert]

Closes #806.

[codecov-commenter]

Codecov Report

Merging #811 (9392029) into master (a58a411) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #811      +/-   ##
==========================================
- Coverage   90.46%   90.45%   -0.02%     
==========================================
  Files          47       47              
  Lines        2433     2430       -3     
==========================================
- Hits         2201     2198       -3     
  Misses        232      232              

Impacted Files	Coverage Δ
R/ui-styling.R	100.00% <100.00%> (ø)
R/utils-files.R	100.00% <100.00%> (ø)

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[github-actions]

This is how benchmark results would change (along with a 95% confience interval in relative change) if 6e5f91e is merged into master:

• cache_applying: 0.05s -> 0.05s [-0.85%, +3.48%]
• cache_recording: 1s -> 1.01s [+0.15%, +1.19%]
• without_cache: 2.67s -> 2.66s [-0.4%, +0.39%]

Further explanation regarding interpretation and methodology can be found in the documentation.