refactor: replace winsdk with toasts_winrt

[DatGuy1]

Closes #55

[codecov]

Codecov Report

Merging #78 (49c89e4) into master (5eac07c) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #78   +/-   ##
=======================================
  Coverage   97.15%   97.15%           
=======================================
  Files          10       10           
  Lines         632      632           
  Branches       80       80           
=======================================
  Hits          614      614           
  Misses         14       14           
  Partials        4        4           

Files Changed	Coverage Δ
src/windows_toasts/events.py	66.66% <100.00%> (ø)
src/windows_toasts/toast_document.py	95.41% <100.00%> (ø)
src/windows_toasts/toast_types.py	100.00% <100.00%> (ø)
src/windows_toasts/toasters.py	95.83% <100.00%> (ø)

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