Update sccp_utils_findBestCodec (added logging where necessary). Use const codecs for sccp_multiple_codecs2str.

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4825 43c1dc8c-776e-4df2-8ef1-6e829299be21
Fix sccp_channel_setDevice / sccp_channel_unsetDevice (thanks Marcello).

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4826 43c1dc8c-776e-4df2-8ef1-6e829299be21
Remove/Refactor sccp_channel_unsetDevice

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4827 43c1dc8c-776e-4df2-8ef1-6e829299be21