Update Control Builder,ChangesFileBuilder,pom.xml,DebMaker

[Turbocyb0rg]

adding properties for the source and target 1.8 to 17 resolved the warning

import java.nio.charset.StandardCharsets; in ControlBuilder

few of the TODO's and FIXNeeded parts

NullOutputStream.NULL_OUTPUT_STREAM is deprecated changed to NullOutputStream.INSTANCE

because NullOutputStream have a field named INSTANCE, resolved the warning. in ChangesFileBuilder and ControlBuilder

String content = IOUtils.toString(in); changed to String content = IOUtils.toString(in, StandardCharsets.UTF_8); in ControlBuilder

this.signDigest = signDigest; changed to this.signDigest = digest;

changes to LsMapper private int convertModeFromString( final String mode )

changes in isSubmodules(), whether the current Maven project is a submodule or not

check if the entry name ends with a symbolic link extension (.symlink) i.e., if (src.getName().endsWith(".symlink"))

[tcurdt]

Thanks for the contribution - but it seems like this has build issues.

It would also be much better to create smaller and more focused PRs.