Make web- variables, colormaps and scales configurable

[heikoklein]

Change Summary

• Convert definitions in python code glob_defaults.py to .ini files (var_web_info and var_ranges_defaults)
• Allow above configurations to be overruled/extended by the same ini-files in user-space
• remove unnecessary check-ranges test since now default-ranges are used

Related issue number

fixes #1221
fixes #1248

Checklist

• Start with a draft-PR
• The PR title is a good summary of the changes
• PR is set to AeroTools and a tentative milestone
• Documentation reflects the changes where applicable
• Tests for the changes exist where applicable
• Tests pass locally
• Tests pass on CI
• At least 1 reviewer is selected
• Make PR ready to review

[codecov]

Codecov Report

Attention: Patch coverage is 88.43537% with 17 lines in your changes missing coverage. Please review.

Project coverage is 79.37%. Comparing base (2dad9c7) to head (d9f234a).
Report is 504 commits behind head on main-dev.

Files with missing lines	Patch %	Lines
pyaerocom/aeroval/glob_defaults.py	86.92%	17 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           main-dev    #1256      +/-   ##
============================================
+ Coverage     79.32%   79.37%   +0.05%     
============================================
  Files           133      133              
  Lines         20316    20439     +123     
============================================
+ Hits          16115    16223     +108     
- Misses         4201     4216      +15     

Flag	Coverage Δ
unittests	79.37% <88.43%> (+0.05%)	⬆️

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