Make property type *Select list* configurable

[jonakieling]

Currently the Select list property type defaults to an integer in the database and a single item. Unfortunately this overrides manuell adjustments to the items config.

Proposition: Let users configure the items of a Select list via the Editor. I am thinking of a text field with comma or pipe seperated lines. This way all features from TCA Documention can be covered. Something like this:

    LLL:EXT:cms/locallang_ttc.php:k1|0|EXT:myext/Resources/Public/selicons/k1.gif|Optional Description
    LLL:EXT:cms/locallang_ttc.php:k2|1|tx-myext-selicons-k2
    LLL:EXT:cms/locallang_ttc.php:k3|2|tx-myext-selicons-k3

Addition: Depending on the value of items the database column type could be derived.