Handle logs

[PHamacher]

• Add Memento to handle logs
• Throw an error instead of a warning when an element from the wrong type is read in the PWF file
• Always read field 'OPERATION' as Char, in order to avoid the error mentioned in Generate error for ESS ImperatrizPS file in DBAR section #28
• New parsing method, reading the PWF file based on line indexes
• Inform the user in which line errors are occurring, using the new parsing method
• Adjust tests to the new parsing method

[codecov]

Codecov Report

Merging #30 (0fc5fb3) into develop (5e8a35e) will decrease coverage by 0.40%.
The diff coverage is 84.37%.

@@             Coverage Diff             @@
##           develop      #30      +/-   ##
===========================================
- Coverage    91.51%   91.11%   -0.41%     
===========================================
  Files           14       14              
  Lines         1061     1069       +8     
===========================================
+ Hits           971      974       +3     
- Misses          90       95       +5     

Impacted Files	Coverage Δ
src/pwf2pm/branch.jl	87.31% <0.00%> (ø)
src/PWF.jl	36.36% <16.66%> (-23.64%)	⬇️
src/pwf2dict.jl	96.29% <91.30%> (+0.03%)	⬆️
src/pwf2pm/bus.jl	95.00% <100.00%> (ø)
src/pwf2pm/correct/anarede.jl	69.64% <100.00%> (ø)
src/pwf2pm/correct/organon.jl	93.75% <100.00%> (ø)
src/pwf2pm/dcline.jl	98.75% <100.00%> (ø)
src/pwf2pm/gen.jl	83.33% <100.00%> (ø)

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