Ensure SendEmail Submit Action parameters are generated as valid JSON.

[medkg15]

WFFM email save actions whose email body contains double quotes would result in an invalid parameters JSON value, causing the Sitecore Forms editor to display blank email values. Using a JSON serializer will ensure valid JSON is generated.

Example input causing failure:

<host>192.168.1.1</host>
<from>noreply@example.com</from>
<isbodyhtml>true</isbodyhtml>
<to>test@example.com</to>
<cc/>
<bcc>test2@example.com</bcc>
<localfrom>noreply@example.com</localfrom>
<subject>Example</subject>
<mail>
	<strong>
		<span style=\"color: #c00000;\">Details</span>
	</strong>
	<div>
		<strong>Name</strong>:&#160;[<label id=\"{EF3C323A-EA48-4C1C-9CDC-FB7E89F82956}\">Name</label>]
	</div>
</mail>

Previous output:

{
	"from": "noreply@example.com",
	"to": "test@example.com",
	"cc": "",
	"bcc": "test2@example.com",
	"subject": "Example",
	"message": "<strong><span style="color: #c00000;">Details</span></strong><div><strong>Name</strong>: [Name]</div>",
	"isHtml": true,
	"customSmtpConfig": "<Host>192.168.1.1</Host>"
}

New output:

(Double quotes are escaped in message field)

{
	"from": "noreply@example.com",
	"to": "test@example.com",
	"cc": "",
	"bcc": "test2@example.com",
	"subject": "Example",
	"message": "<strong><span style=\"color: #c00000;\">Details</span></strong><div><strong>Name</strong>: [Name]</div>",
	"isHtml": "true",
	"customSmtpConfig": "<Host>192.168.1.1</Host>"
}

[afaniuolo]

@medkg15 Thank you for this pull request. I will review it next week.