Make I18nManager.swapLeftAndRightInRTL(true) the default for new apps

This came out of a discussion with Facebook on the current state of RTL support.

Currently, the "left" and "right" layout properties flip when direction = rtl. This is technically not W3C compliant - they are not supposed to flip. The history goes back to this being the only implementation. Now that we have "begin" and "end" versions of these properties, we could change the behavior of "left" and "right", but this is a behavior breaking change.

There was an I18nManager.swapLeftAndRightInRTL API added to make "left" and "right" behavior W3C compliant (ie not flip in rtl mode). Calling I18nManager.swapLeftAndRightInRTL(true) makes "left" and "right" not flip in rtl. Currently the default is false, because it's a breaking behavior change.

It was pointed out that for new apps, we could make I18nManager.swapLeftAndRightInRTL(true) the default, as there's no behavior change for this scenario.

This task is tracking changing the template apps generated by the CLI to turn this on.

Note that we first need to implement I18nManager.swapLeftAndRightInRTL. That is being tracked by #4662.

Review the CLI-generated template apps and the implementation tracked by issue #4662 first, since this task depends on I18nManager.swapLeftAndRightInRTL. Update the generated templates so new apps enable swapLeftAndRightInRTL(true), then verify that the templates contain the setting and still generate correctly.