[ENHANCEMENT] Implement a better Strumline Note Confirm Animation

[gamerbross]

The opponent strumline notes confirm animation were too long and didn't looked great. I increased CONFIRM_HOLD_TIME up to 0.15 and start the timer right when the animation is started and not when finished, just for opponents/botplay, the player confirm animation is almost the same, i just fixed a premature static animation playing when hitting a double note.

resumed list:

• Opponent/Botplay strumline notes confirm animation is stopped earlier so it looks nicer (by starting the stop timer when playing the confirm animation and not when finishing it)
• Player/controlled strumline notes confirm animation is a little bit longer so it doesnt start the "press" animation too early and look weird.

Sorry for not being able to provide a video comparation but i couldnt record it properly

[EliteMasterEric]

Note to self, this makes the same change as #2522.

[AbnormalPoof]

This PR appears to have merge conflicts. Please fix them!