EXPERIMENTAL_FEATURES: import channel_type from lightning/bolts#880

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

wire/extracted_peer_exp_channel_types.patch

@@ -0,0 +1,22 @@
+diff --git a/wire/peer_wire.csv b/wire/peer_wire.csv
+index 40b78f175..8c256bbb6 100644
+--- a/wire/peer_wire.csv
++++ b/wire/peer_wire.csv
+@@ -91,6 +53,8 @@ msgdata,open_channel,channel_flags,byte,
+ msgdata,open_channel,tlvs,open_channel_tlvs,
+ tlvtype,open_channel_tlvs,upfront_shutdown_script,0
+ tlvdata,open_channel_tlvs,upfront_shutdown_script,shutdown_scriptpubkey,byte,...
++tlvtype,open_channel_tlvs,channel_type,1
++tlvdata,open_channel_tlvs,channel_type,type,byte,...
+ msgtype,accept_channel,33
+ msgdata,accept_channel,temporary_channel_id,byte,32
+ msgdata,accept_channel,dust_limit_satoshis,u64,
+@@ -109,6 +73,8 @@ msgdata,accept_channel,first_per_commitment_point,point,
+ msgdata,accept_channel,tlvs,accept_channel_tlvs,
+ tlvtype,accept_channel_tlvs,upfront_shutdown_script,0
+ tlvdata,accept_channel_tlvs,upfront_shutdown_script,shutdown_scriptpubkey,byte,...
++tlvtype,accept_channel_tlvs,channel_type,1
++tlvdata,accept_channel_tlvs,channel_type,type,byte,...
+ msgtype,funding_created,34
+ msgdata,funding_created,temporary_channel_id,byte,32
+ msgdata,funding_created,funding_txid,sha256,