Refactoring with adding watchers threads to the core module

src/cutecoin/core/account.py

src/cutecoin/core/community.py

src/cutecoin/core/net/network.py

src/cutecoin/core/net/node.py

src/cutecoin/core/watchers/__init__.py

src/cutecoin/core/watchers/blockchain.py

src/cutecoin/core/watchers/nodes.py

src/cutecoin/gui/currency_tab.py

src/cutecoin/gui/process_cfg_community.py

src/cutecoin/models/network.py