Add remaining FlixelTweenTypes LOOPING, PINGPONG and BACKWARD

[jfsaaved]

Issue: #38

• Add LOOPING, PINGPONG, and BACKWARD to FlixelTweens
• Add active variable
• Add delayToUse variable
• Add waitingForRestart variable

Description

The goal is to include the BACKWARD, LOOPING and PINGPONG tween types to allow further control of the tweening system.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactor / Optimization

Checklist

• My PR targets the develop branch, not master/main.
• My code follows the code style of this project.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• My changes pass all automated build checks.
• I have updated the documentation accordingly (if applicable).
• I have added tests that prove my fix is effective or that my feature works.

Screenshots / Evidence (if applicable)

PINGPONG

LOOPING

BACKWARD

[stringdotjar]

Nice job! There's just a few things to do left you need to do before I merge it into the codebase:

• Fix your formatting to match what's in the .editorconfig file. Remember, we want the codebase to look like it was written by a single person
• Update the Javadocs and your comments as stated in the GitHub comments I left
• When the tween restarts, it goes back to the starting values where the tween started at before the tween started. This should not happen. For example, if a sprite had its x field start at 0f, and it's being tweened to 400f, and it was cancelled and restarted at 200f, it should restart and begin at 200f, not back from 0f. This applies to all tween types
• Refactor destroy() to use the reset() method and replace the resetBasic() call in reset() to use destroy(), as we want both methods to do the same thing for backwards compatibility

[stringdotjar]

Nice j*b! I'll merge it for you :>