Use colors/safe

[bcaudan]

Motivation

fixes #528, avoid string prototype pollution

Changes

• use colors/safe
• introduce theme class to apply theme to string
• remove prototype pollution from specs

[codecov]

Codecov Report

Merging #538 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #538   +/-   ##
=======================================
  Coverage   99.80%   99.80%           
=======================================
  Files          16       16           
  Lines         500      518   +18     
  Branches       69       70    +1     
=======================================
+ Hits          499      517   +18     
  Misses          1        1           

Impacted Files	Coverage Δ
src/display/execution-display.ts	100.00% <ø> (ø)
src/configuration-parser.ts	100.00% <100.00%> (ø)
src/display-processor.ts	100.00% <100.00%> (ø)
src/display/summary-display.ts	100.00% <100.00%> (ø)
src/processors/default-processor.ts	100.00% <100.00%> (ø)
src/processors/pretty-stacktrace-processor.ts	97.56% <100.00%> (ø)
src/processors/spec-colors-processor.ts	100.00% <100.00%> (ø)
src/spec-reporter.ts	100.00% <100.00%> (ø)
src/theme.ts	100.00% <100.00%> (ø)

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