Make template as a html string available

[ErikDohmen]

Through this update you could send a html string as a template instead of using a predefined template blade file.

[Faks]

Hi, the idea is good, but technically we can publish the view and override it, easier option would just have a config option to override it.

[ErikDohmen]

@Faks, true, definitely true. What I wanted to accomplish is that you could have a database field with the template which you can edit easily and if you have different devisions with their own invoice templates then that would be possible. So therefor a config variable isn't really what I was looking for, even though I can follow your thoughts.