Added setting to swap stats and modifiers

Although Schemas.Character was changed, a database migration should
not be required due to the way characterSettings handles it (since
undefined is a falsy value).

rpg-docs/client/views/character/characterSettings/characterSettings.html

@@ -14,6 +14,9 @@
 				<paper-toggle-button id="variantEncumbrance" checked={{settings.useVariantEncumbrance}}>
 					Use variant encumbrance
 				</paper-toggle-button>
+				<paper-toggle-button id="swapStatAndModifier" checked={{settings.swapStatAndModifier}}>
+					Swap stats and modifiers on Stats page
+				</paper-toggle-button>
 			</div>
 		</app-header-layout>
 		<div class="buttons layout horizontal end-justified">