fix: enable and disable functionality

[toshan-luktuke]

This Pull Request changes the enable and disable functionality. It now works by modifying the value of the SHM of the Enable wire.
For e.g.

inputs.enabled = False

The above line will set the value of the Shared Memory Object that holds the data of the Enable wire to 0
on the other hand,

inputs.enabled = True

This will set the value of the Shared Memory Object that holds the data of the Enable wire to 1

This has been tested with the following setup:

The output is as follows, it lets the blocks selectively enable and disable themselves, it also prevents context switching while a block waits idly.