Make label for ilastik executable system specific

[m-novikov]

Closes: #54

[k-dominik]

this could potentially also address #57 :)

[m-novikov]

@emilmelnikov mentioned that using the old imagej1 api to query for OS should probably be avoided.

I would use it because:

1. There is no alternative in imagej2 API
2. There is no deprecation annotation
3. Personally I doubt that it will ever be deprecated

[k-dominik]

• There is no alternative in imagej2 API

• There is no deprecation annotation

• Personally I doubt that it will ever be deprecated

compelling argument :) @emilmelnikov what do you think?

I also found that alternatives seem to be somewhat convoluted. In the end we'd probably write and maintain our own routines for .isOSX() et. al...

[emilmelnikov]

I looked up the implementation of IJ.isOSX() and it just checks a system property. So we could just replace it with:

bool isMac = System.getProperty("os.name").toLowerCase().startsWith("mac");

[m-novikov]

I looked up the implementation of IJ.isOSX() and it just checks a system property. So we could just replace it with:

bool isMac = System.getProperty("os.name").toLowerCase().startsWith("mac");

I mean why would we implement it ourselves if it's already implemented for us? :)

[emilmelnikov]

I mean why would we implement it ourselves if it's already implemented for us? :)

I don't have a strong opinion about this, but I wouldn't using ImageJ 1 for such a trivial thing.

[k-dominik]

At least it's going to be easy to replace if they every get rid of IJ :)