Bug #1765276: Added all the bootstrap variables back into the raw variables and added default flags

Change-Id: I28f6534fd92abea7bbfe4277e3a2722bbfccd630

htdocs/theme/raw/sass/lib/bootstrap4/_bootstrap.scss

@@ -6,7 +6,7 @@
  */
 
 @import "functions";
-@import "variables";
+@import "../../utilities/bootstrap-variables";
 @import "mixins";
 @import "root";
 @import "reboot";