Icudtl.dat fix

[HinTak]

Download icudtl.dat in CI, re-enable tests and update README.m130.

Fixes #268

[HinTak]

The CI error is

File "<string>", line 1
      'import
            ^
  SyntaxError: EOL while scanning string literal

It is either all the quotes and double quotes, or the length. Probably need to put it in a shell script.

[HinTak]

Okay, venv is significantly different from just plain running "import skia; ...".

And it is failing on something that used to pass:

================================== FAILURES ===================================
  ____________________________ test_svg_blob_bounds _____________________________
  
  svg_blob = None
  
      def test_svg_blob_bounds(svg_blob):
  >       bounds = svg_blob.bounds()
  E       AttributeError: 'NoneType' object has no attribute 'bounds'
  
  D:\a\skia-python\skia-python\tests\test_font.py:255: AttributeError
  ---------------------------- Captured stderr setup ----------------------------
  SkIcuLoader: datafile missing: C:\Users\runneradmin\AppData\Local\pypa\cibuildwheel\Cache\nuget-cpython\python.3.8.10\tools\icudtl.dat.
  _____________________ test_fontmgr_custom_svg_blob_bounds _____________________
  
  svgfont_path = 'D:\\a\\skia-python\\skia-python\\skia\\resources\\fonts\\SampleSVG.ttf'
  
      def test_fontmgr_custom_svg_blob_bounds(svgfont_path):
          svgface = skia.FontMgr.New_Custom_Empty().makeFromFile(svgfont_path)
          text = "abcdefgh"
          font = skia.Font(svgface,109)
          svg_blob = skia.TextBlob.MakeFromShapedText(text, font)
  >       bounds = svg_blob.bounds()
  E       AttributeError: 'NoneType' object has no attribute 'bounds'
  
  D:\a\skia-python\skia-python\tests\test_font.py:270: AttributeError
  ============================== warnings summary ===============================

[HinTak]

Filed the shaper failure upstream: https://issues.skia.org/371224771

[HinTak]

Started a discussion over at rust-skia rust-skia/rust-skia#1041

[HinTak]

So the presence of the file on windows breaks shaping. If it is absent, you get a warning (and likely something else does not work)

[MeetWq]

use

import sys
print(sys.base_prefix)

to get python path?

https://stackoverflow.com/questions/54641473/get-path-to-original-python-executable-not-the-virtualenv

[HinTak]

Superceded by #279