Make all classes final since not intended to be extended

[westonruter]

Fixes #340

[codecov-io]

Codecov Report

Merging #360 (550fdb9) into develop (17e23ef) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             develop     #360   +/-   ##
==========================================
  Coverage      25.54%   25.54%           
  Complexity       362      362           
==========================================
  Files             54       54           
  Lines           1785     1785           
==========================================
  Hits             456      456           
  Misses          1329     1329           

Flag	Coverage Δ	Complexity Δ
php	25.54% <ø> (ø)	0.00 <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ	Complexity Δ
...ass-wp-service-worker-admin-assets-integration.php	0.00% <ø> (ø)	15.00 <0.00> (ø)
...p-service-worker-custom-background-integration.php	0.00% <ø> (ø)	5.00 <0.00> (ø)
...ss-wp-service-worker-custom-header-integration.php	0.00% <ø> (ø)	16.00 <0.00> (ø)
...lass-wp-service-worker-custom-logo-integration.php	0.00% <ø> (ø)	7.00 <0.00> (ø)
...ions/class-wp-service-worker-fonts-integration.php	0.00% <ø> (ø)	2.00 <0.00> (ø)
...ns/class-wp-service-worker-scripts-integration.php	0.00% <ø> (ø)	21.00 <0.00> (ø)
.../class-wp-service-worker-site-icon-integration.php	0.00% <ø> (ø)	6.00 <0.00> (ø)
...ons/class-wp-service-worker-styles-integration.php	0.00% <ø> (ø)	21.00 <0.00> (ø)
wp-includes/class-wp-https-detection.php	85.00% <ø> (ø)	29.00 <0.00> (ø)
wp-includes/class-wp-https-ui.php	83.15% <ø> (ø)	37.00 <0.00> (ø)
... and 13 more

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[felixarntz]

👍