IO.copyFile does not respect CopyOptions.overwrite

[dwickern]

The method is documented as "overwriting any existing content" but accepts a CopyOptions().withOverwrite(false) and then overwrites the file

io/io/src/main/scala/sbt/io/IO.scala

Lines 888 to 894 in 6121f5e

	/**
	* Copies the contents of `sourceFile` to the location of `targetFile`, overwriting any existing content.
	*
	* See [[sbt.io.CopyOptions]] for docs on the options available.
	*/
	def copyFile(sourceFile: File, targetFile: File, options: CopyOptions): Unit =
	copyFile(sourceFile, targetFile, options.preserveLastModified, options.preserveExecutable)