Add basic personalisation blocks

[tm-kn]

Issue #68

• Add "visible to everyone" segment setting for PersonalisedStructBlock.

• Add the render_fields keyword argument for PersonalisedStructBlock. Setting of the same name can be also set on Meta class of the block.

  • It takes a list of field names and renders them in order without titles.
  • If set to None, it will just use StructBlock's render() (as currently, displaying field titles & content or template specified in Meta).

• Add a few more default blocks so they work out of the box.

  • PersonalisedCharBlock
  • PersonalisedImageChooserBlock
  • PersonalisedRichTextBlock
  • PersonalisedTextBlock

[codecov[bot]]

Codecov Report

Merging #135 into master will not change coverage. The diff coverage is 57.14%.

@@           Coverage Diff           @@
##           master     #135   +/-   ##
=======================================
  Coverage   68.47%   68.47%           
=======================================
  Files          55       55           
  Lines        2217     2217           
=======================================
  Hits         1518     1518           
  Misses        699      699

Impacted Files	Coverage Δ
src/wagtail_personalisation/blocks.py	58.82% <57.14%> (ø)	:arrow_up:

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[tomdyson]

@tm-kn can you look at the 2.7 failures, please?

[codecov-io]

Codecov Report

Merging #135 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #135   +/-   ##
=======================================
  Coverage   92.83%   92.83%           
=======================================
  Files          66       66           
  Lines        2010     2010           
=======================================
  Hits         1866     1866           
  Misses        144      144

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Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update a47803e...1d18a82. Read the comment docs.