RemapperTransformer: Add option to not rename class package

[lab313ru]

Before rename all classes were placed in my_package folder in jar. But after remapping they are all placed in the root folder of that jar.

[lab313ru]

All classes from all packages are just moved to the root folder.

[EpicPlayerA10]

Yes, this is an intended feature. But of course we can add an option that will not rename package, only class names.

[KnoxTheDev]

patched in https://github.com/narumii/Deobfuscator/pull/105 , just waiting for it to be merged