Replace all curly during multio configuration initialization

[tweska]

Instead of having to call replace curly for each option separately, this change will expand all the curly brackets for every string value when the multio configuraiton is initialized.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 77.64706% with 19 lines in your changes missing coverage. Please review.

Project coverage is 53.20%. Comparing base (9d06daf) to head (11ece82).

Files with missing lines	Patch %	Lines
src/multio/config/PlanConfiguration.cc	50.00%	4 Missing ⚠️
src/multio/util/Substitution.cc	71.42%	4 Missing ⚠️
.../multio/action/statistics/cfg/StatisticsOptions.cc	66.66%	3 Missing ⚠️
src/multio/action/encode/GridDownloader.cc	0.00%	2 Missing ⚠️
src/multio/sink/FileSink.cc	50.00%	2 Missing ⚠️
src/multio/action/encode/Encode.cc	50.00%	1 Missing ⚠️
src/multio/action/encode/GribEncoder.cc	0.00%	1 Missing ⚠️
...ultio/action/interpolate-fesom/InterpolateFesom.cc	0.00%	1 Missing ⚠️
src/multio/config/MultioConfiguration.cc	97.22%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #67      +/-   ##
===========================================
+ Coverage    53.07%   53.20%   +0.12%     
===========================================
  Files          218      218              
  Lines        14840    14810      -30     
  Branches      1221     1222       +1     
===========================================
+ Hits          7877     7879       +2     
+ Misses        6963     6931      -32     

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