Implement legacy bar hit error meter

[bdach]

hit.error.meter.-.HD.1080p.mov

	stable	this PR
osu!, OD=0
osu!, OD=5
osu!, OD=10
taiko, OD=0
taiko, OD=5
taiko, OD=10
mania, OD=0
mania, OD=5
mania, OD=10

Things matching stable:

• Position of meter on unmodified legacy skins
• Size of meter
• Scaling of meter width with OD (widths of bars are derived directly from hit windows)
• Hit bar size & animation
• Moving average arrow animation

Things intentionally not matching stable:

• Arrow indicator slightly larger (unsure why, measurements taken verbatim from stable - possibly due to not using the same exact png asset and instead using Triangle)
• Colours intentionally different
• MEH bars intentionally not shown in taiko because they are stable lies (nothing in stable taiko uses that hit window)
• mania shows bars for PERFECTs and GOODs
• Meter does not fade out when there are no recent hits (may be brought back later if there are complaints about it)

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Follow-ups / scope limits:

• I have introduced a const for the magic 1.6f constant that shows up everywhere in 443f09d (see also: Implement legacy back button UI #37676 (comment)). I have not however attempted to replace all inline references to 1.6f with the const here, I would ask that to be considered for a separate PR.
• In catch the meter degenerates to the following:
  
  stable would use the colour hit meter style instead here. Bringing back parity in that respect was attempted in Use colour hit error meter in catch #38269.

[unststable]

just curious, why different colors?

[bdach]

Because they are the same standard colours used all over lazer for hit results and I am not changing them for this.

[peppy]

One thing the stable hit error bar did was fade out when there were no recent hits.

Doesn't necessarily have to happen here, let's wait and see if people point it out post release. Might be something which is better re-implemented on a higher level (ie there's probably other components that players may want to fade in/out in a similar way, so being able to apply to arbitrary skin components might be nice).