Piccolo

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``TableConfig`` now has a ``hooks`` argument - so custom logic can be run when
a row is added / deleted / modified. Thanks to Anton-Karpenko for suggesting
this feature.

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The WYSIWYG editor we use for ``rich_text_columns`` has been modified, so the
user can now create HTML headings. Thanks to tigerline86 for suggesting this
feature and sinisaos for implementing it.

Rows can now be bulk modified - for example, if you have 100 blog posts which
need converting to ``draft=False``, it can now be easily done using the
Piccolo Admin GUI in a single operation (courtesy sinisaos).

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More sandbox fixes.

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Fixed a bug with the sandbox.

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The user can now change their password in the Piccolo Admin UI (courtesy
sinisaos).

After submitting a custom form with Piccolo Admin, the UI used to show the
response message in a popup at the bottom of the screen. It now shows a success
page instead, which is better if the response message is long, as it's easier
for the user to read. Thanks to ethagnawl for reporting this issue.

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Fixing a bug with serialising ``Enum`` instances in migrations. For example:
``Varchar(default=Colour.red)``.

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