🎉 Adds Visual Flow

[AlexandreSajus]

2021-12-12.03-28-50_1.mp4

Pressing a run button will now highlight in green the graph traversal that is made to gather the blocks to run
Running blocks are now highlighted in red

Closes #66

[AlexandreSajus]

visual.flow.4.mp4

I have modified the behavior so that all of the left transmitting animations start at the same time. Perhaps this looks better.

Also Codacy is angry and I can't find out why

[AlexandreSajus]

Requested changes:

• The green transmitting effect should be done according to distance to the block (1: the block, 2: the connected edges, 3: the blocks connected by the edges from 2,...)
• A block that will be executed should stay green until it is run
• The execution and the red running effect should start at the end of the green transmitting effect
• Animation speed should be easily controllable for further testing

Gimme a minute...

[vanyle]

Merge failed ... Git adds back functions into codeblock that belong inside executionblock, like:

• run_left
• run_right
• _interrupt_execution
• ...

Try to move as much flow code into the executableblock as other block types like the slider might enjoy having those.
For example, the transmitting_queue variable and all methods dealing with it should be in the executableblock class.

[AlexandreSajus]

Added requested changes:

visual_flow.mp4

Looks much better now

A check fails for no reason, the feature works in local

[vanyle]

The way github shows the code snippets attached to review comment is misleading. This view is better:
https://github.com/Bycelium/PyFlow/pull/114/files/042b491bd387ee6fd719eacd56627a5f2d6c61dd#diff-4e9f706551f31121752e22f2c9a3b78b9874e6008a0ab0356a02a3128be84872

[vanyle]

Looking good !