[Typo3] extMgm addPlugin types

[Meinte van't Kruis]

The code about t3lib_extMgm::addPlugin contains:

 void   addPlugin  (array $itemArray, [string $type = 'list_type'])

    * array $itemArray: Item Array
    * string $type: Type (eg. "list_type") - basically a field from
"tt_content" table

I'm wondering what kind of types are available (feuseradmin has plugin
type '20' for example, I have no idea what it stands for), and what
are the differences between them.

thx for the help,

Meinte 
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