Support Custom SSL truststore on Android

[don-spyker]

Feature Request

Motivation Behind Feature

If the inappbrowser should connect to a website via https and the SSL certificate is self-signed or issued/created with a company's root certificate the inappbrowser is not opening the website. This is also the case if you install the custom certificate on the device. The access to the website works when using target '_self' or target '_system', but not when using target '_blank'.
The inappbrowser is not even handling the error, but that is handled in #292. This issue is about enabling the inappbrowser to use the a custom truststore.

On iOS the inappbrowser is already trusting all certificates that are enabled on the devices. This issue targets Android.

Feature Description

Trust a custom certificate to avoid SSL errors while opening a website that is secured with a non public root CA.

Alternatives or Workarounds

Use target '_self' or target '_system' -> not appropriate in all cases
Use public CA -> -> not appropriate in all cases

[chiluhimanshu2221]

This is not the plugin issue. Android had following handshake rules to communicate with self signed ssl . I have resolved my issue by using certificate inside my build. Please follow https://developer.android.com/training/articles/security-config

[timbru31]

Thanks @chiluhimanshu2221