feat: freemarker support

[paulwer]

while working in java based envs, a lib called freemarker for generating html could be used. we are currelty looking for using mailwind to generate the templates here.

We would like it, if .ftl files can also get parsed by the mailwind lib, without issues.
we currelty discovered the following misbehaviors:

• .ftl commands are parsed as comments => <#if> =>

this would be great <3