Add incoming file transfer request into chat window and remove the old dialog.
Add globally unique id into Kopete::Message.
Add defualt incoming file transfer request style to make it work with all styles.

File transfer request look can be changed with Incoming/FileTransferRequest.html in chat style.
Supported style tags are: fileName, fileSize, fileIconPath, saveFileHandlerId, saveFileAsHandlerId, cancelRequestHandlerId

Save, save as and cancel buttons have to have id="%saveFileHandlerId%", id="%saveFileAsHandlerId%", id="%cancelRequestHandlerId%".

For now we don't support Adium style because they require JavaScript (security problem).