Adding LESS settings

- Added setting to be able to disable the border-box if you already defined that in your own css
- Added setting to be able to disable touch-action if you already defined that in your own css
- Added setting to choose not to use !important for sr-only class

src/less/variables.less

@@ -3,6 +3,11 @@
 // https://github.com/selz/plyr
 // ==========================================================================
 
+// Settings
+@plyr-border-box:                       true;
+@plyr-touch-action:                     true;
+@plyr-sr-only-important:                true;
+
 // Colors
 @plyr-color-main:                       #3498db;