Vk-sdk

- [+] Provide __slots__ for most of classes
- [=] Improve docs
- [+] command emulation
- [+] User.write will fix 'attachment' argument if you made a typo
- [+] Provide tests
- [+] Database (partially) stashes changes made during event handling
- [=] Longpoll fixes and optimizations
- [+] Panels

- [+] Minor fixes to import queue

- [+] Import queue
- [+] ``__import_order__.py``, create this file in your subpackage to specify import order

- [+] Segregate databases
- [+] Multi-database support
- [+] use_db parameter for structs (used db defined in config.json by default)
- [+] AuthBasedMethodExecutor, allows you to define callback on failed auth
- [+] imports.require function, acts like node.js require
- [+] Add some short paths for functions and classes
- [+] Struct(create_new), don't add db row if record wasn't found

- [=] Remove relations between Database class and AbstractLongPoll class

- [+] New max_two_buttons strategy on keyboard
- [=] Bug fixes introduced with structs rewrite
- [+] after_text_matcher: match text on after function
- [=] Fix write(after) behaviour
- [+] Drop column if it's not existing in struct
- [=] Fix issues with initializing structs
- [+] MethodExecutor class, usefull to create your own method executors
- [+] AbstractLongPoll, BotLongPoll