Use reciprocal of tempo when syncing time signals to Transport

[yifanmai]

Previously, signals with time units were synced to Transport by connecting it to the tempo signal, which has frequency units. This unit mismatch caused incorrect behavior, e.g. a time signal would double instead of halving as expected when bpm doubles. Now, signals with time units are connected to the reciprocal of the tempo signal instead, which also has time units.

fixes #879

[codecov[bot]]

Codecov Report

Merging #1050 (a392067) into dev (aad2d8c) will increase coverage by 0.02%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev    #1050      +/-   ##
==========================================
+ Coverage   98.43%   98.45%   +0.02%     
==========================================
  Files         184      184              
  Lines        7691     7724      +33     
  Branches      665      679      +14     
==========================================
+ Hits         7570     7604      +34     
+ Misses         36       34       -2     
- Partials       85       86       +1     

Impacted Files	Coverage Δ
Tone/core/clock/Transport.ts	98.47% <100.00%> (+0.10%)	:arrow_up:
Tone/source/buffer/Player.ts	97.32% <0.00%> (-0.89%)	:arrow_down:
Tone/core/context/ToneAudioBuffer.ts	99.26% <0.00%> (-0.01%)	:arrow_down:
Tone/event/Pattern.ts	100.00% <0.00%> (ø)
Tone/core/clock/Ticker.ts	100.00% <0.00%> (ø)
Tone/event/PatternGenerator.ts	100.00% <0.00%> (ø)
Tone/component/analysis/Meter.ts	100.00% <0.00%> (ø)
Tone/instrument/MetalSynth.ts	97.18% <0.00%> (+0.04%)	:arrow_up:
Tone/core/clock/TickSource.ts	97.33% <0.00%> (+0.56%)	:arrow_up:
Tone/core/context/Context.ts	97.32% <0.00%> (+1.14%)	:arrow_up:

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[yifanmai]

On further thought, this PR has an issue whereby the new intermediate signal operators don't get garbage collected when the signal is unsynced. I'll fix this shortly.

[tambien]

Great PR! thanks you!