biiiig update

• Types and their mappings are represented via a (generic) Type object. This allows for encapsulation of mapping.

Before:

$table->findBy([
    $table::ID => $queriedId->toString(), // <- I have to duplicate mapping implementation
]);

After:

$table->findBy([
    $table::ID => $table->id()->map($queriedId),
]);

• Scaffolding can optionally generate default primary key implementation.

• Proper nette/di extension.

• 🍏 Tests 🎉

cc @dkurowski