Scrap options in label for th2 export

[speleo3]

Add support for scrap options in the layer label. These options have the highest priority and overwrite global options (command line --scale, --projection, --options). They also overwrite options from the therion:options attribute, if present.

Breaking changes:

• therion:options now overwrites command line --options
• New default for --scale is undefined, previous value was 100
• Scrap name ends at first - (space, dash)

@AHspeleo FYI

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.21%. Comparing base (cae9256) to head (3601fd5).

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #26      +/-   ##
==========================================
+ Coverage   74.14%   74.21%   +0.07%     
==========================================
  Files          13       13              
  Lines        4080     4084       +4     
==========================================
+ Hits         3025     3031       +6     
+ Misses       1055     1053       -2     

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