✨🐛 Implement import sprites API and several fixes

[pleonex]

Description

Finally it's here. APIs to allow to import sprite images into their original format. For instance, import a set of PNG files into Nintendo DS format NCER. In order to achieve it, several features and bug fixes were required:

• Fix issue reading some NCER files
• Implement serialization of NCER (Ncer2Binary) and related subtypes.
• Implement image segmentation algorithm similar to requirements for NDS.
• Fix drawing sprites when different layers not taking into account IDs
• Fix serialization of NCLR causing skipping some colors
• Update CLI to import sprites
• Update CLI to export individual sprite cells
• Improve FixedPaletteTileQuantization:
  • Return palette indexes for each tile
  • Set transparency to 255 if we are using transparent color
  • Avoid using transparent color for non-transparent pixels (when the RGB components are the same)
  • Fix finding best palette when having transparent color

Small changes

• Cell names have the index padded to 3 digits.
• NCGR: improve perf by saving swizzling in some cases
• Create empty test project
• Add documentation to some APIs
• Add debugger viewer to some APIs
• Quantization APIs return a type instead of a tuple

Example

Due to the complex nature and different use cases, there isn't a class that does the process. Check out how it's done for the Nitro formats (src\Texim.Tool\NitroCommandLine.cs in ImportSprites). In the future we may consider creating this class for some generic use cases.