Support sending ink messages in ISF format

[diederik]

It turns out the official client sometimes ignores our Ink messages. See http://www.kmess.org/board/viewtopic.php?f=2&t=3302 for more information. Claims:

• messages are sent as both INK and GIF.
• which one is accepted depends on whether Windows Journal is installed or not.
• amsn created a 'libisf' for this.

This needs to be verified (it could also be possible our GIF message is wrong), and if needed support for ISF needs to be implemented.

[valerio]

r4115: Initial import of LibISF, an attempt to write a Qt4 library to encode and decode ISF data.

It's in trunk/libisf . License is LGPL 2.1+.

I think that, without external contributions, it'll only be able to work for WLM's isf drawings. But it's easily worked on, so I hope it will go beyond that simplistic target... One can only hope :)

[valerio]

Posticipated to 2.1 for lack of time.

[valerio]

See  emesene's trac for more details.

I'm posting here their python INK lib, just for reference. It seems fairly well documented and easy to understand too.

[valerio]

emesene code for isf ink. They may have a newer one in their VCS.

[valerio]

This was done with the completion of the isf-qt library, available  here.