No direct search execution

Revert "Lazy search execution"

This reverts commit 95a8e37d986b141b2caee5b396741b93cd31c0e6.

Lazy search execution

Move search out of aggregation constructors. It should only be executed
before actual rendering, not e.g. on metadata run

Cloud: display count when summarize is configured

Implements #613

added classes config parameter

This allows users to set custom CSS classes on aggregations potentially
restyling them differently for different use cases.

This makes startScope and finishScope part

added classes config parameter

This allows users to set custom CSS classes on aggregations potentially
restyling them differently for different use cases.

This makes startScope and finishScope part of the public API of the
Aggregation class. It should no longer be called within render() but is
instead called outside.

This might potentially break plugins implementing their own
aggregations. Needs to be checked

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some streamlining for the aggregation classes

Have an abstract base class for aggregations to ensure proper
signatures, reuse more code from the table syntax

Manual code style adjustments

PHP code sniffer autofixes

Automatic coding style fixes

properly encode comperor for cloud tag

chane comparator for cloud-tags

fix: ensure that displayValue of page is never empty

This could have been the case when the page is non-existent and has
never existed or is not a clean pageid due to a changed type of the
column.

refactor: condense sequential functions

refactor: use existing constants and functions

doc: update php docstrings

feat: make images in clouds square

Also move the code to generate tag cloud links to the AbstractBaseType
and overwrite it in Media and Color

refactor: make sortString available for all types

feat: make Cloud renderer-agnostic

feat: enable target option for cloud

Enable the target option for cloud, so we can define another page where
the aggregation to be filtered is located.

feat: render colors and images in cloud

Known issues: currently the images are scaled by their width. However
that makes potrait-images much larger than landscape-images of the same
count. However s

feat: render colors and images in cloud

Known issues: currently the images are scaled by their width. However
that makes potrait-images much larger than landscape-images of the same
count. However since we do not know the size of the image in php, we may
have to fix this with javascript.

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feat: sort in php and sort colors by hue

We moved the sorting to php and added a extra sort function for colors
by their hue.

refactor: cleanup of AggregationCloud

refactor: remove unnecessary class

We do not reuse any styles from struct aggregations

refactor: rename methods to be more specific

refactor: Set font-sizes in php