Support using "clipboard" as argument for text and header manipulation functions

[RealRaven2000]

New feature to set headers based on the clipboard contents, for example:

%header.set(to,clipboard)%
%header.append(to,clipboard)%

it could also be useful like this:

%replaceText(regularExpression,clipboard)%
%replaceQuotedText(regularExpression,clipboard)%

[RealRaven2000]

Here is a first test version:

smartTemplate-fx-3.11.1pre8.zip

To tryout this version, download the zip file and then drag it into Thunderbird Add-ons Manager (without extracting)

[RealRaven2000]

There was a problem parsing the clipboard parameter and it got lost so here is a working version:

smartTemplate-fx-3.11.1pre9.zip

To test this version, download the zip file and then drag it into Thunderbird Add-ons Manager (without extracting)

Here is a test template file I used. This is meant to be used with any email address in the clipboard, replying to (or forwarding) an email. The email I replied to contained also the text "Hello Daily!" which will be with "Hello (clipboard-contents)!" in the quoted portion of the mail.

%replaceText("email-here",clipboard)%
%replaceQuotedText("Daily",clipboard)%
<h1> Clipboard Functions </h1>
%header.append(to,clipboard)%
<p>Enter email here: email-here</p>

[gregbythebeach]

The https://smarttemplate-fx-3.11.1pre9.zip/ worked perfect for me, only tested it a few times so far, but I used %header.set(to,clipboard)%

[RealRaven2000]

Implemented in 3.12.1 on 28/06/2022

[RealRaven2000]

Please also see issue #210, which fixes issues when using clipboard multiple times. it would be great if you could download the prerelease to test if it still works as expected after modifications.