Add binary_basename configuration option

[neonichu]

Makes it easier to select the right binary to consider for code coverage computation. Instead of having to pass the full path to your framework, you can just configure its basename and it will be found ✨

[stepheng]

Would it be possible to update this so --binary-basename can be passed from the command-line instead of requiring the .slather.yml. Thanks.

[neonichu]

Yah, I think adding a --binary-basename makes sense.

[larslockefeer]

Small question: How does this relate to the binary_file option added by @viteinfinite in #92? Wouldn't it be enough to allow passing in just a name as this parameter instead of a path and use this value to find the matching binary file?

Our current invocation of slather is:

slather coverage --input-format profdata --cobertura-xml --scheme $appScheme --binary-file "$COVERAGE_BASE"/CodeCoverage/$appName/Products/Debug-iphonesimulator/$appName.app/$appName $projectFile

... while I think that this should be enough:

slather coverage --input-format profdata --cobertura-xml --scheme $appScheme --binary-file $appName $projectFile

[neonichu]

I think it makes sense to offer both options, —binary-file would override any automatism of slather (e.g. for working around cases where Xcode changes paths, like 7.3 does), while —binary-basename would be the more common choice where one just wants to pick a binary with a specific name, but the automatic resolution works.

[neonichu]