Replace current font download with Python script

[mapmeld]

After recent comments / mentions on my earlier PR #4893 and seeing switch2osm/switch2osm#278 , I'm proposing a smaller change

This PR:

• adds get-fonts.py , a Python script using the same source as the current get-fonts.sh ; we can recommend this method for current installs and future PRs / maintenance
• uses working URLs for CJK and Noto Emoji fonts
• comments that get-fonts.sh is deprecated, but leaves it in the repo in case to minimize changes
• replaces no fonts (I want to upgrade Noto Arabic, but can save this for future changes to the Python script)

[imagico]

This looks like a good step forward on the matter, starting with converting the download script to python and fixing the download errors. Further improvements can be made in subsequent changes.

[imagico]

Thanks a lot for this - it brings us a big step forward regarding the fonts management.

Further steps can be discussed in #5043.