Performance improvements for connecting nodes

What's Changed

• added cache for downstream and upstream nodes by @quitinit in #217

Full Changelog: v1.1.1...v1.2.0

Performance improvement by removing unnecessary node and plug updates

What's Changed

• added check if is_dirty is already set by @quitinit to remove unnecessary costly overhead in graph creation and evaluation: #215

Add type hints

Added type hints for Flowpipe following mypy guidelines

v1.0.4

Fix for loading nodes when their module is not in the pythonpath at the time of loading it

v1.0.2

Fixes an error we encountered with printing a node. If a node receives a precomputed input that is a string, and you try to print the node, it errors with the error

ValueError: expected '}' before end of string

The reason for that is that it tires to f-print a truncated string representation of a dictionary, which includes a curly brace.
Curly braces, however, have special meaning in f-string. It then errors out since the string input has not been sanitized.

String sanitation before passing the string to the f-string method has now been added!

v1.0.1

Add missing loading of module when deserializing nodes from files

Version 1.0: Dropping Py2 support and Cleanup

• Dropped Py2 support
• Cleanup of Code
• Fix for Pickling Error #168
• FunctionNodes can now be used directly without going through the Node decorator

v0.10.1

Add previously deleted Plug._sub_plugs method back in for backwards compatibility.

Full Changelog: v0.10.0...v0.10.1

Poetry and code quality

• Addopting poetry
• Code quality

Graph input groups

Convenient feature: Make input plugs of nodes available directly on the graph for easy access.