Add attachment object type and permissions
Add attachment object type and permissions to the corresponding XMLs.
Add forgotten permission (canUploadAttachment)
Respect LOG_IP_ADDRESS setting
Fix MessageAttachmentObjectType.class.php
Add first pieces of attachment upload

Currently the upload is working, but it's impossible to delete the
attachment or generate a "attachment message"
Merge branch 'master' into attachments

Conflicts:
	template/javascriptInclude.tpl
Improve attachment system

Now it's possible to upload attachments and generate an attachment
message. The attachments are registered in the database correctly and
can be viewed WCF's attachment list in ACP.

TODO: Proper design in frontend and some backend functions.
Add missing style declarations
Adapt to WoltLab/WCF@d9e099418464c2e433725a139f6c5330672b150e
Fix sorting of uses in Message.class.php
Add permission check to canDownload() in

MessageAttachmentObjectType.class.php
Merge branch 'master' into attachments
Improve front end design of attachment
Delete attached files on deletion of messages
Properly encode usernames and room titles
Merge branch 'master' into attachments
Improve attachments in UI
Merge branch 'attachments'