Use StateFlow

[floschu]

Fixes #10

[codecov]

Codecov Report

Merging #16 into develop will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##           develop       #16   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            7         7           
  Lines          162       162           
  Branches         8         8           
=========================================
  Hits           162       162           

Impacted Files	Coverage Δ
...otlin/at/florianschuster/control/implementation.kt	100.00% <100.00%> (ø)
...src/main/kotlin/at/florianschuster/control/stub.kt	100.00% <100.00%> (ø)

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