Fix tyop in private class name

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
AutoImporters: refactor the ImportStatementGenerator factory

The auto-imports are more useful for the interpreter than for the editor
(nobody wants to reuse interpreter histories in different setups, unlike
scripts).

Therefore, we need to rip up the DefaultAutoImporters class a little bit
so that we can use it also in the interpreter.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Move the auto-importer plugin discovery into the correct place

The script editor should not need to hold a reference to the
auto-importers...

Besides, we are about to use the auto-import feature in the script
interpreter, so we need to hold the reference to the auto-importer
plugins somewhere else...

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
wip

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>