resip/recon: eliminate errors about namespace ambiguity

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/main@10123 ddefafc4-47db-0310-ae44-fa13212b10f2
resip/recon: add some comments/commented code for dynamically loading codecs from sipX

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/main@10124 ddefafc4-47db-0310-ae44-fa13212b10f2