[CB-3820] clarify location of iOS's local config.xml
[CB-3820] no top-level 'app' directory in path to Android's local config.xml
[CB-3820] minor reformat to platform-specific config.xml
[CB-3820] clarify iOS's config.xml lives in dir named after app
[CB-3820] CHECK: clarify loc of platform-specific config.xml
[CB-3962] re-pack lines for editing
[CB-3810] rewrite whitelist guide
[CB-4203] pre-3.0 android whitelisting n/a for images/scripts
[CB-4203] need to avoid script injection
[CB-3810] xref other platform-specific content
[CB-2099] non-whitelist links may open in browser
[CB-4203] loadingDialog preference removed
[CB-4203] loadingPageDialog preference removed
[CB-4203] errorUrl preference removed
[CB-4203] added InAppBrowserStorageEnabled pref