Add upgradecores function to prepare script. (#213)

* Add upgradecores function to prepare script.

Differences from preparebinonly:

- If with/withoutcoins isn't set
  - Read list of coins to update from basicswap.json
    - Only where manage_daemon or manage_wallet_daemon is true
- Store core version no in basicswap.json
  - Only update if missing or differs.
- Writes core_version_no and core_version_group to basicswap.json
  - Per core updated
  - Backup old config to timestamped file

* Upgrade unmanaged coin cores by default.

Disable with BSX_UPDATE_UNMANAGED.

basicswap/bin/run.py

@@ -223,7 +223,7 @@ def getWalletBinName(coin_id: int, coin_settings, default_name: str) -> str:
     ) + (".exe" if os.name == "nt" else "")
 
 
-def getCoreBinArgs(coin_id: int, coin_settings):
+def getCoreBinArgs(coin_id: int, coin_settings, prepare=False):
     extra_args = []
     if "config_filename" in coin_settings:
         extra_args.append("--conf=" + coin_settings["config_filename"])
@@ -234,7 +234,7 @@ def getCoreBinArgs(coin_id: int, coin_settings):
     # As BCH may use port 8334, disable it here.
     # When tor is enabled a bind option for the onionport will be added to bitcoin.conf.
     # https://github.com/bitcoin/bitcoin/blob/master/doc/release-notes/release-notes-28.0.md?plain=1#L84
-    if coin_id == Coins.BTC:
+    if not prepare and coin_id == Coins.BTC:
         port: int = coin_settings.get("port", 8333)
         extra_args.append(f"--bind=0.0.0.0:{port}")
     return extra_args