GeezerVison

Added type comments as per PEP 561 to type all public API while staying Python 2 compatible. (type definitions only need to be compatible with non EOL python versions. Using type comments instead of inline-types allows the code to still run on Python 2)

Added a py.typed marker to let type checkers know that this package provides its own types. And to not look for external type-stubs.

Some dynamic types (like Struct, Request, Event, ...) are naturally incomplete, but this was more than enough for my needs. And would add a lot of complexity to support.

For this to be as accurate as possible, the following should also be looked at:

• xlib.error does not inherit from base exception #222 / randr: inherit XError in error classes #242
• Should ReplyRequest and ConnectionSetupRequest inherit from Request? #244
• Prefer bool over Literal[0, 1, None] #247
• Fix potential usage of None and Unbound variables issues #248
• Standardize return type of parse_binary_value to bytes #249
• Explicit arguments with *args and **kwargs #250