SwiftWin32: work towards 32-bit cleanliness

[compnerd]

This corrects the type mismatches at a number of sites to make the code
32-bit clean. This is required to enable the use of Swift/Win32 on
32-bit Windows targets.

[codecov]

Codecov Report

Merging #699 (febccda) into main (5dbd402) will decrease coverage by 0.89%.
The diff coverage is 1.25%.

❗ Current head febccda differs from pull request most recent head 2169fa1. Consider uploading reports for the commit 2169fa1 to get more accurate results

@@            Coverage Diff             @@
##             main     #699      +/-   ##
==========================================
- Coverage   26.16%   25.27%   -0.90%     
==========================================
  Files         129      130       +1     
  Lines        5121     5334     +213     
==========================================
+ Hits         1340     1348       +8     
- Misses       3781     3986     +205     

Impacted Files	Coverage Δ
...iftWin32/App and Environment/ApplicationMain.swift	0.00% <0.00%> (ø)
...urces/SwiftWin32/Text Display and Fonts/Font.swift	14.45% <0.00%> (ø)
...ources/SwiftWin32/Views and Controls/Control.swift	68.10% <0.00%> (ø)
...ces/SwiftWin32/Views and Controls/PickerView.swift	0.00% <0.00%> (ø)
...n32/Views and Controls/Table Views/TableView.swift	0.00% <0.00%> (ø)
...urces/SwiftWin32/Views and Controls/TextView.swift	0.00% <0.00%> (ø)
Sources/SwiftWin32/Support/WinSDK+Extensions.swift	14.28% <10.00%> (ø)
...ources/SwiftWin32/Views and Controls/Stepper.swift	77.33% <50.00%> (ø)
...ources/SwiftWin32/Windows and Screens/Window.swift	26.35% <0.00%> (+5.40%)	⬆️