Handle lineSeparator conversion with tokens LF / CRLF

[Wykiki]

This PR is linked to my comment on the issue #106

We are now able to provide the lineSeparator information with :

<license.lineSeparator>LF</license.lineSeparator>
<license.lineSeparator>CRLF</license.lineSeparator>

I tried to do the smallest change possible to avoid breaking anything, I'm not sure that it fits the codebase as I've not spent much time looking into the project.

[slawekjaranowski]

Should be done in AbstractFileHeaderMojo we can do setter method for config property lineSeparator, we should also update documentation on this property.

[slawekjaranowski]

Please move to AbstractFileHeaderMojo

[Wykiki]

Updated to correct file, but not sure if setter is correctly picked up.
I wanna write test for that, should I duplicate the existing one like what's under src/it/update-file-header-test-mojo for this purpose ?

[slawekjaranowski]

Please also update documentation for field in Java docs

    @Parameter(property = "license.lineSeparator")
    private String lineSeparator;

It will be used for generating description like in: https://www.mojohaus.org/license-maven-plugin/update-file-header-mojo.html#lineSeparator

[slawekjaranowski]

You can duplicate src/it/update-file-header-test-mojo but can be simplified only for checking lineSeparator

[Wykiki]

Tried to implement tests, but it looks like line ending got replaced by system one when either \r\n or \n characters ends up as the lineSeparator property.

I may have more time to dig that later, but if you have any clue where this could happen, feel free to give advice !

I suspect something around following lines :

• https://github.com/mojohaus/license-maven-plugin/blob/master/src/main/java/org/codehaus/mojo/license/header/transformer/FileHeaderTransformer.java#L67
• https://github.com/mojohaus/license-maven-plugin/blob/master/src/main/java/org/codehaus/mojo/license/header/transformer/AbstractFileHeaderTransformer.java#L239

[slawekjaranowski]

Even it is test file should follow java conventions, class should the same name as file.
Please also check other test files.

[slawekjaranowski]

Please always build locally ... last change has issue reported by spotless.