Update timesteps bugfix

[lrennels]

• We need to add the (deprecated) keyword argument update_timesteps to update_params! so that it throws a warning instead of an error
• update_param! on a model definition needs to use copyto!, otherwise we are breaking the connection between the model instance's component instance parameters (they use views for their TimestepArray data) and the model instance's model def's external parameters

https://forum.mimiframework.org/t/using-mimiiwg-jl/158

[codecov]

Codecov Report

Merging #809 (b2ff89b) into master (38ca256) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #809   +/-   ##
=======================================
  Coverage   83.95%   83.96%           
=======================================
  Files          39       39           
  Lines        3478     3479    +1     
=======================================
+ Hits         2920     2921    +1     
  Misses        558      558           

Flag	Coverage Δ
unittests	83.96% <100.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
src/core/model.jl	87.50% <ø> (ø)
src/core/connections.jl	88.35% <100.00%> (+0.04%)	⬆️

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