Replace J2kImageWriteParam#lossless by ImageWriteParam#compressionType

[gunterze]

Replace

    /** JPEG2000 lossless, default true */
    private boolean lossless; 

from

package org.dcm4che3.opencv;
:
public class J2kImageWriteParam extends ImageWriteParam

in favor of using existing

package javax.imageio;
public class ImageWriteParam extends IIOParam {
:
    protected String compressionType;
:
    public void setCompressionType(String compressionType) {..}
    public String getCompressionType() {..}

with

public class J2kImageWriteParam extends ImageWriteParam {
    private static final String[] COMPRESSION_TYPES = { "LOSSY", "LOSSLESS" };

Related #417 #416 #414