Create config system to store per-project processing info

[iannesbitt]

Should include a system to output a default config.

Parameters:

• bool merge flag
• bool archive flag
• bool intensity to RGB flag
• int RGB scaling multiplier
• str fallback geoid reference for when VRS is not defined in file header
• str geoid region
• int manual Z adjustment factor
• list[str, ...] manual list of files

Possible structure:

{
  "merge": false,
  "archive": false,
  "i_to_rgb": true,
  "rgb_scale": 1,
  "geoid_fallback": "GEOID18",
  "geoid_region": "contiguous",
  "translate_z": 0,
  "file_list": [
    "f1.laz",
    "f2.laz"
  ]
}