To better align with multiple client protocols, this PR

Refactors the existing RPC directory, classes, defs as below.
This is to better reflect the nature of the files/classes/defs to support other clients - such as rest

The code is functional, ive tested every RPC button in Telegram.
1 unit test is failing ( they all were till find_replace) in test_rpc_telegram.

Can I ask for anothers opinion on why this 1 test fails, im at loss to debug
- mocker is stretching my working knowledge of python -

Ive renamed common methods from RPC_method_name to server_method_name
e.g rpc_stop becomes server_stop, the super class is CLIENTS not RPC as it is agnostic to RPC

freqtrade/rcp/ - rpc.py
......................- rpc_manager.py
......................- telegram.py

to:

freqtrade/clients/client_manager.py (was rpc_manager
......................-common/client.py (was rpc.py - but is agnostic to what client calls)
......................-rpc/telegram.py
......................-rpc/*discord.py (example future RPC client
......................-rest/*cmd line.py (example future rest cmdline rest client
......................-rest/*web.py (example future rest web client

freqtrade/tests/test_freqtradebot.py

@@ -30,7 +30,7 @@ def get_patched_freqtradebot(mocker, config) -> FreqtradeBot:
     :return: None
     """
     mocker.patch('freqtrade.freqtradebot.Analyze', MagicMock())
-    mocker.patch('freqtrade.freqtradebot.RPCManager', MagicMock())
+    mocker.patch('freqtrade.freqtradebot.ClientManager', MagicMock())
     mocker.patch('freqtrade.freqtradebot.persistence.init', MagicMock())
     mocker.patch('freqtrade.freqtradebot.exchange.init', MagicMock())
     patch_coinmarketcap(mocker)
@@ -53,12 +53,12 @@ def patch_get_signal(mocker, value=(True, False)) -> None:
 
 def patch_RPCManager(mocker) -> MagicMock:
     """
-    This function mock RPC manager to avoid repeating this code in almost every tests
-    :param mocker: mocker to patch RPCManager class
-    :return: RPCManager.send_msg MagicMock to track if this method is called
+    This function mock CLIENT manager to avoid repeating this code in almost every tests
+    :param mocker: mocker to patch ClientManager class
+    :return: ClientManager.send_msg MagicMock to track if this method is called
     """
-    mocker.patch('freqtrade.freqtradebot.RPCManager._init', MagicMock())
-    rpc_mock = mocker.patch('freqtrade.freqtradebot.RPCManager.send_msg', MagicMock())
+    mocker.patch('freqtrade.freqtradebot.ClientManager._init', MagicMock())
+    rpc_mock = mocker.patch('freqtrade.freqtradebot.ClientManager.send_msg', MagicMock())
     return rpc_mock