feat(windows): add content padding/margin components for wp

also split all of the modes up so they can have different amounts of
padding/margin on their content

references #5565

ionic/components.wp.scss

@@ -12,6 +12,7 @@
   "components/button/button.wp",
   "components/checkbox/checkbox.wp",
   "components/chip/chip.wp",
+  "components/content/content.wp",
   "components/radio/radio.wp",
   "components/segment/segment.wp",
   "components/toolbar/toolbar.wp";