[VM-336] +: Made return path (checkout/cart) configurable

showInStore missing on some groups

Replace "Place order" by "Place Order" like Magento

Compatibility with PHPUnit 6

Create nl_NL.csv

Show payment link in admin for remaining order balance

When not supported by browser, the link can still be copied manually

* Fix for returning only selected boleto types in checkout

* Fix not showing boleto type field if only one field is configured

* Added validation of the Boleto Types field

This link only shows when the original order payment method is an
Adyen method, the total due is greater than 0 and the invoiced total
is greater than 0.

Made payment URL generation method public

Place Order function race condition fix

[VM-233] +: isButtonActive function for databind +: set isPlaceOrderActionAllowed on start place order event

Pw 352

Added boleto logo

Remove Cron controller should not be accessable from browser,

* Fix PayPal capture mode

* Changed variable name to manualCapturePayPal

fix for klarna_account

* PW-349: Show message if not on latest version of the extension

* PW-349: Replaced with correct \Exception type

* PW-349: Changed wording to "extension", added "Adyen" in the di name.

* PW-349: Added Session to store the github info and call github only once, changed severity of the message to MAJOR(warning) since the messages are only displayed with CRITICAL(1) or MAJOR(2), the inbox message is still stored with severity NOTICE(4), added quotes to href.

* PW-349: Removed try/catch in getText, renamed session variable

 remove exti and die statements what is not allowed, changed reservered PHP7 name resource to resourceModel following magento conventions and fix to use the right exeption class