feat: added possibility to change text color and background color of the selected row

[dundee]

fixes #168

[coveralls]

Pull Request Test Coverage Report for Build 3029635846

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 34 of 37 (91.89%) changed or added relevant lines in 2 files are covered.
• 25 unchanged lines in 3 files lost coverage.
• Overall coverage increased (+0.8%) to 96.943%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
tui/tui.go	22	25	88.0%

Files with Coverage Reduction	New Missed Lines	%
report/export.go	1	94.41%
cmd/gdu/app/app.go	10	93.45%
tui/tui.go	14	89.53%

Totals
Change from base Build 3025439325:	0.8%
Covered Lines:	2220
Relevant Lines:	2290

---

💛 - Coveralls

[codecov]

Codecov Report

Merging #170 (42c8b1b) into master (263f106) will decrease coverage by 0.23%.
The diff coverage is 81.25%.

@@            Coverage Diff             @@
##           master     #170      +/-   ##
==========================================
- Coverage   94.73%   94.49%   -0.24%     
==========================================
  Files          27       27              
  Lines        2450     2471      +21     
==========================================
+ Hits         2321     2335      +14     
- Misses         93       99       +6     
- Partials       36       37       +1     

Impacted Files	Coverage Δ
tui/tui.go	86.04% <71.42%> (-3.46%)	⬇️
cmd/gdu/app/app.go	91.22% <100.00%> (+0.60%)	⬆️

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