[MNG-6919] fix wrapper windows cmd scripts

[gzm55]

new maven-wrapper inherits 2 bugs for windows batch scripts:

• correct file ending for windows cmd scripts
• download.cmd should parse the config file

This pr is ported from takari/maven-wrapper#161.

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[michael-o]

please drop the gitattributes changes

[gzm55]

please drop the gitattributes changes

can we make all the cmd scripts to crlf at the releasing stage?

[gzm55]

@michael-o
as @rfscholte comment in the issue, eol is fixed in assembly-plugin settings, so i revert the changes on all .gitattributes file.