lightningd: allow extra tlv types in non-experimental mode.

The old `experimental-accept-extra-tlv-types` is now `accept-htlc-tlv-types`.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Changelog-Added: Config: `accept-htlc-tlv-types` lets us accept unknown even HTLC TLV fields we would normally reject on parsing (was EXPERIMENTAL-only `experimental-accept-extra-tlv-types`).

doc/lightning-listconfigs.7.md

@@ -97,7 +97,8 @@ On success, an object is returned, containing:
 - **log-timestamps** (boolean, optional): `log-timestamps` field from config or cmdline, or default
 - **force-feerates** (string, optional): force-feerate configuration setting, if any
 - **subdaemon** (string, optional): `subdaemon` fields from config or cmdline if any (can be more than one)
-- **fetchinvoice-noconnect** (boolean, optional): `featchinvoice-noconnect` fileds from config or cmdline, or default
+- **fetchinvoice-noconnect** (boolean, optional): `fetchinvoice-noconnect` fields from config or cmdline, or default
+- **accept-htlc-tlv-types** (string, optional): `accept-extra-tlvs-type` fields from config or cmdline, or not present
 - **tor-service-password** (string, optional): `tor-service-password` field from config or cmdline, if any
 - **dev-allowdustreserve** (boolean, optional): Whether we allow setting dust reserves
 
@@ -217,5 +218,4 @@ RESOURCES
 ---------
 
 Main web site: <https://github.com/ElementsProject/lightning>
-
-[comment]: # ( SHA256STAMP:310cc00ef62e7075d5d2588b0492c2dd96f507cc739f67d56ccc6c4f3135bca5)
+[comment]: # ( SHA256STAMP:5871ac751654339ed65ab905d61f0bc3afbb8576a33a5c4e9a73d2084f438582)

doc/lightningd-config.5.md

@@ -424,6 +424,12 @@ the outgoing is redeemed.
 might need to redeem this on-chain, so this is the number of blocks we
 have to do that.
 
+* **accept-htlc-tlv-types**=*types*
+
+  Normally HTLC onions which contain unknown even fields are rejected.
+This option specifies that these (comma-separated) types are to be
+accepted, and ignored.
+
 ### Invoice control options:
 
 * **autocleaninvoice-cycle**=*SECONDS* [plugin `autoclean`]

doc/schemas/listconfigs.schema.json

@@ -281,7 +281,11 @@
     },
     "fetchinvoice-noconnect": {
       "type": "boolean",
-      "description": "`featchinvoice-noconnect` fileds from config or cmdline, or default"
+      "description": "`fetchinvoice-noconnect` fields from config or cmdline, or default"
+    },
+    "accept-htlc-tlv-types": {
+      "type": "string",
+      "description": "`accept-extra-tlvs-type` fields from config or cmdline, or not present"
     },
     "tor-service-password": {
       "type": "string",

doc/undoc-flags.json

@@ -1,6 +1,5 @@
 {
     "flags": [
-        "experimental-accept-extra-tlv-types",
         "channel-fee-max-base-msat",
         "channel-fee-max-proportional-thousandths",
         "funder-fund-probability",
@@ -18,4 +17,4 @@
         "lease-fee-basis",
         "lease-funding-weight"
     ]
-}
+}