Change RangeMap to be a hierarchy of structures with entries

[theWituch]

This PR changes much of way RangeMap is built and how RangeAplier uses it to process java source file. RangeMap specification stays same.

At first, it changes data model of RangeMap:

• RangeMap now stores elements hierarchically
• RangeMap starts with abstract structure called ROOT
• each structure can store other structures (children) and entries (also children) and so on
• this hierarchy is an reflection of this what is stored in range file

Secondly, this changes RangeApplier to process RangeMap:

• starting from ROOT structure
• getting all childrens (structures and entries)
• and processing them recursively
  By processing it mean:
• sorting children (as IRange) by start position to proper shifting data (important)
• processing each child with [StructuralEntry/RangeEntry]Processor based on type:
  = if child is just RangeEntry it does same action like previously - replaces text occurence in output string
  = if child is a StructuralEntry it does processing "from start" (like starting from ROOT)

In each case all tests passes. It needed to correct some patterns (misplaced entries).

I don't know how you planned to do this kind of feature, but i think my solution will be very comfortable to expand processing functionality in future. This is good start to other features such:

• moving class to no-package (see https://github.com/MinecraftPlus/Srg2Source/commits/package)
• comment inserting, because we can handle whole structure such class, field, method (see https://github.com/MinecraftPlus/Srg2Source/commits/comments)
• removing code parts like methods, fields or whole classes based on custom conditions (I'm using this for removing code parts marked with Dist annotations - see https://github.com/MinecraftPlus/Srg2Source/commits/remover)
• and other :P

If something is unclear or need to correct, please give me feedback.