[Plugin] Precise volume control

[Araxeus]

precise-volume plugin

The original volume slider and shortcuts lets you control volume only in steps of 5% or 10%,
this has always bothered me, there isn't enough control - especially around the lower percentages

So I made this small plugin to fix that (name could be changed):

Features

• You can now have precise control over volume percentage by using mouse-wheel in play bar area (bottom bar)
  each step add/subtract [1%] (default can be changed)

• Optional setting to change volume with local hotkey - arrowkeys up/down (Like in native youtube)

• Advanced option in config to setup global hotkeys

• Advanced option to change volume steps (int 1-100 representing percentage change)
  Will use prompt type: "Counter" to allow controlling this setting once the custom prompt from Menu tweaks #224 gets implemented

• Plugin also makes the Volume slider + icon tooltip's always show the exact current volume percentage

• Precise volume is saved and restored between sessions

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Misc

To override the default mousewheel + arrowkey behavior of the volume bar, I had to do a trick before DOMContent loaded
(The only way to remove an eventListener created with an anonymous function is to catch it before its created)

Initially I just added the code to the main preload.js but later thought it would probably be better to enable all plugins to do some preload
so, I added an option for Every Plugin to add a preload.js to be executed from Renderer before DOMContent loaded

Note on the original volume slider

• Dragging it with the cursor still works the same way.
• When changing the volume using this plugin - it gets visually updated only around every 5% volume
  For example, there is no visual difference between 5% and 7%
  (that's pretty much the main reason I added the tooltip with volume percentage)

I'm not too sure how to visually modify the slider itself without native youtube functionality breaking, if it's even possible

[th-ch]

Looks mostly good and seems to work fine, thanks for the contribution! Just a comment to make the code defensive and then it should be good to merge 👍

[th-ch]

Looks ok, thanks for the contribution, merging! ✅