[stores/ini] Relax ini parser

[ghost]

Specifically: Allow hash/semicolon in values and Python multi-line indented values - refs #751

[codecov-commenter]

Codecov Report

Merging #752 into develop will increase coverage by 0.29%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #752      +/-   ##
===========================================
+ Coverage    33.35%   33.64%   +0.29%     
===========================================
  Files           23       23              
  Lines         3076     3082       +6     
===========================================
+ Hits          1026     1037      +11     
+ Misses        1917     1913       -4     
+ Partials       133      132       -1     

Impacted Files	Coverage Δ
pgp/keysource.go	30.25% <100.00%> (ø)
stores/ini/store.go	29.89% <100.00%> (+2.36%)	⬆️
stores/flatten.go	90.29% <0.00%> (+4.85%)	⬆️

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[felixfontein]

Looking at this in the context of #1597, I think this is a breaking change. Adding it to #1435.