Port to D8/9/10

Problem/Motivation

We should port the module to Drupal 8! I noticed some of the actions are "outdated" or not that nicely structured so we should take some time to do a proper clean up and develop every feature (if possible) like the old D7 version.

Proposed resolution

Complete all the porting tasks.

Remaining tasks

#3009846: Add .module with help() hook.
#3009945: Add a README.txt
#3009948: Add a MAINTAINERS.txt
#3009950: Add a CHANGELOG.txt
#3009979: Change documentation URL in the readme.txt
#3009910: Create the configuration screen
#3009912: Port the: Redirect action
#3011077: Show indicator in the tabs if an Actions is enabled or not.
#3011080: Create a validation hook for the "Key Code Sequence" field
#3011115: Implement a general "enabled" toggle in the module configuration
#3011171: Move module under "other" section in the modules page
#3009916: Port the: Alert action
#3012193: Remove the settings.yml to load classes more dynamic

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When above issues are completed we can create the alpha release 8.x-1.0-alpha1

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#3009922: Port the: Raptorize action
#3009915: Port the: Image attack action
#3009917: Port the: Flip text action
#3013062: Improve on default values
#3012933: Add min to number field

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When above issues are completed we can create the alpha release 8.x-1.0-alpha2

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#3009921: Port the: Placekitten action
#3014310: Make PlaceKittens more general
#3009925: Port the: Snowfall action

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When above issues are completed we can create the alpha release 8.x-1.0-alpha3

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#3009920: Port the: Asteroids action
#3015964: Add missing dependencies to constructors
#3013066: Validate internal/external links
#3011116: Add option to include or exclude pages for execution

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When above issues are completed we can create the alpha release 8.x-1.0-alpha4

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In no particular order.
#1884976: Create the: Translator action
#3009918: Port the: Cornify action
#3009923: Port the: Katamari Hack action
#3009927: Port the: Browserponies action

Other ideas:
Snake
Slothify (replacing all text with sloth sloth and images with random sloths)

List to be completed/enlarged :).

General note: We should also create tests for this if possible since I don't know if it's really possible to simulate keystrokes and check for something to happen.

Issues marked as won't port:
#3009926: Port the: gg action
#3009919: Port the: Geocities-izer action

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Documentation

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Following issue should be kept up to date on a rolling basis.
#3009980: Write Documentation (drupal.org)
The actual documentation can be found here: https://www.drupal.org/docs/8/modules/konami-code

User interface changes

Additional actions will be added to the configuration screen.

API changes

Complete re-write to D8 standards!

Data model changes

N/A