Move instant messaging related ports to newly created net-im category:
net/aim -> net-im/aim
net/amsn -> net-im/amsn
net/ari-yahoo -> net-im/ari-yahoo
net/ayttm -> net-im/ayttm
net/bsflite -> net-im/bsflite
net/ccmsn -> net-im/ccmsn
net/centericq -> net-im/centericq
net/cicquin -> net-im/cicquin
net/coccinella -> net-im/coccinella
net/convey -> net-im/convey
net/echat -> net-im/echat
net/ejabberd -> net-im/ejabberd
net/firetalk -> net-im/firetalk
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