Misc. cleanup

[JensAyton]

Odds and ends:

• EventSource+Extensions.swift is now EventSourceMap.swift for consistency with ConnectableContramap/ConnectableMap
• AnyConnectable is now a struct, since it has no reason not to be
• Mobius enum is declared the normal way
• Default error handler no longer prints call stack, default behaviour should be as vanilla as possible and clients can customize already
• BeginnerLoop uses EffectRouter to avoid guiding people in the wrong direction

@jeppes

[codecov]

Codecov Report

Merging #154 into master will increase coverage by 0.12%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #154      +/-   ##
==========================================
+ Coverage   94.34%   94.47%   +0.12%     
==========================================
  Files          46       46              
  Lines        1291     1284       -7     
==========================================
- Hits         1218     1213       -5     
+ Misses         73       71       -2     

Flag	Coverage Δ
#ios	94.47% <100.00%> (+0.12%)	⬆️
#macspm	94.41% <100.00%> (+0.12%)	⬆️

Impacted Files	Coverage Δ
MobiusCore/Source/Mobius.swift	97.18% <ø> (ø)
MobiusCore/Source/MobiusHooks.swift	66.66% <ø> (+16.66%)	⬆️
MobiusExtras/Source/EventSourceMap.swift	100.00% <ø> (ø)
MobiusCore/Source/Connectable.swift	100.00% <100.00%> (ø)
MobiusExtras/Source/BeginnerLoop.swift	100.00% <100.00%> (ø)

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[JensAyton]

Fixed a silly bug. I’m surprised that was possible!