Add support of tickers like BTC, BTC-segwit.

[artemii235]

It will make UX much more convenient in GUIs. BTC-segwit will be always activated in Segwit mode and BTC in legacy. The only problem is to have the same order book for both.

[artemii235]

Implementation checklist:

• [x] Add orderbook_ticker field to coins config for all protocols.
• [x] Add orderbook_tickers: HashMap<String, String> to OrdermatchContext.
• [x] Add base_orderbook_ticker: Option<String> and rel_orderbook_tickerr: Option<String> to MakerOrder and TakerOrder. Store it if coin_ticker != orderbook_ticker.
• [x] Use orderbook_ticker in orderbook/best_orders request instead of the initial coin ticker. Also, use it in all related P2P messages.
• [x] Add integration tests matching coins with different tickers but same orderbook tickers.
• [ ] Clarify best_orders handling after this feature is implemented.
• [x] Check that orderbook_depth works properly for all tickers.
• [ ] Document RPC response additions/changes.

[artemii235]

@smk762 Could you please document the changes outlined in https://github.com/KomodoPlatform/atomicDEX-API/pull/1116#issuecomment-954651554?

[artemii235]

@smk762 Could you please also add orderbook_ticker to the coins repo Readme, and add -Segwit version with orderbook_ticker of each coin having bech32 prefix?

[smk762]

requested updates completed in mentioned PRs above

[artemii235]

Great, I'm closing the issue then, thanks!