If we have a 0-length string just ignore it.
Fixes issue 2942

Change-Id: I963aab86ff426fed0fa22fdbd1b3dce36818106a
Reviewed-on: http://gerrit.dmdirc.com/88
Reviewed-by: Chris Smith <chris@dmdirc.com>
Tested-by: Chris Smith <chris@dmdirc.com>

Fixes issue 3104.

Change-Id: I6e9b5c3a3d0e9d3cbe6aa9ef3252650509a610eb
Reviewed-on: http://gerrit.dmdirc.com/87
Reviewed-by: Chris Smith <chris@dmdirc.com>
Tested-by: Chris Smith <chris@dmdirc.com>

Issue 3111

Change-Id: Ieb8ca1c74cbe1e8fd9c9ba1ff4934fe3db1729c4
Reviewed-on: http://gerrit.dmdirc.com/86
Reviewed-by: Chris Smith <chris@dmdirc.com>
Tested-by: Chris Smith <chris@dmdirc.com>

Fixes issue 3113

Change-Id: I5d6c28039ac104f6809e5a4cc97da2dd5da1931c
Reviewed-on: http://gerrit.dmdirc.com/77
Reviewed-by: Gregory Holmes <greboid@dmdirc.com>
Tested-by: Gregory Holmes <greboid@dmdirc.com>

Change-Id: I0ca6f30dd39aaa4ddf48fc52b8cf98529c5a35a8
Reviewed-on: http://gerrit.dmdirc.com/63
Reviewed-by: Gregory Holmes <greboid@dmdirc.com>
Tested-by: Gregory Holmes <greboid@dmdirc.com>

Issue 2921.

Remove the ability to change OutputQueue due to confusion, just allow changing the OutputHandler.

OutputHandlers are now incharge of creating QueueItems and comparing them.
Parser now allows for replacing the OutputQueue entirely
Default OutputQueue allows replacing of the OutputHandler (by giving it a new QueueFactory that outputs the alternative QueueHandler)
Sending PING is now High Priority
QueueItems now sort by a unique itemNumber not time, as priority queue doesn't guarentee order for itesm of teh same priority created at the same time
Add a rate-limited OutputQueue