xF2 Add-on AndyB First post length 1.5

First post length v1.5 changes:

ATTACH and IMG tags are now not counted in minimum characters required.

First post length v1.4 changes:

Fixed issue with improperly declared function.

First post length v1.3 changes:

Fixed issue with checking first post length of message when creating a new thread.

First post length v1.2 changes:

Fixed issue with non thread post causing error.

First post length v1.1 changes:

Now properly getting and returning parent.