Remove toConnection and to from signaling
Remove toConnection and to from signaling

toConnection and to are not part of the signaling protocol. This
was not causing problems, but it's worth cleaning up while we're
in here. It's confusing for it to be there though, so removing
it makes the code clearer.

JeeLiu/respoke-sdk-ios,respoke/respoke-sdk-ios,iosyoujian/respoke-sdk-ios,i-miss-you/respoke-sdk-ios,Havi4/respoke-sdk-ios,Havi4/respoke-sdk-ios,i-miss-you/respoke-sdk-ios,JeeLiu/respoke-sdk-ios,Havi4/respoke-sdk-ios,respoke/respoke-sdk-ios,iosyoujian/respoke-sdk-ios,i-miss-you/respoke-sdk-ios,JeeLiu/respoke-sdk-ios,respoke/respoke-sdk-ios,iosyoujian/respoke-sdk-ios