Refactor the project by using Mixin classes

This will cut client.py down from ~4k to ~1k SLOC and also
makes the whole project tidier and more organized.

pyrogram/client/ext/base_client.py

@@ -0,0 +1,95 @@
+# Pyrogram - Telegram MTProto API Client Library for Python
+# Copyright (C) 2017-2018 Dan Tès <https://github.com/delivrance>
+#
+# This file is part of Pyrogram.
+#
+# Pyrogram is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published
+# by the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Pyrogram is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with Pyrogram.  If not, see <http://www.gnu.org/licenses/>.
+
+import re
+from queue import Queue
+from threading import Lock
+
+from ..style import Markdown, HTML
+from ...api.core import Object
+from ...session.internals import MsgId
+
+
+class BaseClient:
+    INVITE_LINK_RE = re.compile(r"^(?:https?://)?(?:t\.me/joinchat/)([\w-]+)$")
+    BOT_TOKEN_RE = re.compile(r"^\d+:[\w-]+$")
+    DIALOGS_AT_ONCE = 100
+    UPDATES_WORKERS = 1
+    DOWNLOAD_WORKERS = 1
+    OFFLINE_SLEEP = 300
+
+    MEDIA_TYPE_ID = {
+        0: "thumbnail",
+        1: "thumbnail",
+        2: "photo",
+        3: "voice",
+        4: "video",
+        5: "document",
+        8: "sticker",
+        9: "audio",
+        10: "gif",
+        13: "video_note"
+    }
+
+    def __init__(self):
+        self.token = None
+        self.dc_id = None
+        self.auth_key = None
+        self.user_id = None
+        self.date = None
+
+        self.rnd_id = MsgId
+        self.channels_pts = {}
+
+        self.peers_by_id = {}
+        self.peers_by_username = {}
+        self.peers_by_phone = {}
+
+        self.markdown = Markdown(self.peers_by_id)
+        self.html = HTML(self.peers_by_id)
+
+        self.session = None
+        self.media_sessions = {}
+        self.media_sessions_lock = Lock()
+
+        self.is_started = None
+        self.is_idle = None
+
+        self.updates_queue = Queue()
+        self.updates_workers_list = []
+        self.download_queue = Queue()
+        self.download_workers_list = []
+
+    def send(self, data: Object):
+        pass
+
+    def resolve_peer(self, peer_id: int or str):
+        pass
+
+    def add_handler(self, handler, group: int = 0) -> tuple:
+        pass
+
+    def save_file(
+            self,
+            path: str,
+            file_id: int = None,
+            file_part: int = 0,
+            progress: callable = None,
+            progress_args: tuple = ()
+    ):
+        pass