symphonists / association_field

* add support to filter by related field (regex etc depending on field support) f3af2ba
* remove unintended vardump b0eeb30

Picked from bedce23

Signed-off-by: Nils Hörrmann <nils.hoerrmann@hananils.de>

See introduction of `prepareReadableValue` in `2.0.0`

This release raises the Symphony requirement to version 2.6 due to the core function name change.

Signed-off-by: nitriques <nico@nitriques.com>

…_BY handling

It's time, let's do this.

This will give interfaces the ability to add custom styling

Fixes hananils/association_ui_selector/symphonycms#51

I've been trying to import some associations from an Older Symphony, whenever there were multiple relations it was just appending the entry id's to each other, rather than treating them separately. I'm not sure if the default mode should be `ImportableField::ARRAY_VALUE` however this was the only way I was able to import from XML Importer. Also the array should return the data as expected by `processRawFieldData` not execute it, otherwise it tries to insert `Array` into the database instead of the entry ID.

- Merged in changes from Select Box Link
- Code clean-up

Related to mazedigital/association_ui_selector#10