Where condition to add to the query used to get data from the database. Multiple conditions can be added if required. Can be used in two different ways: * Simple case: `where( field, value, operator )` * Complex: `where( fn )` The simple case is fairly self explanatory, a condition is applied to the data that looks like `field operator value` (e.g. `name = 'Allan'`). The complex case allows full control over the query conditions by providing a closure function that has access to the database Query that Editor is using, so you can use the `where()`, `or_where()`, `and_where()` and `where_group()` methods as you require. Please be very careful when using this method! If an edit made by a user using Editor removes the row from the where condition, the result is undefined (since Editor expects the row to still be available, but the condition removes it from the result set).

public Editor Where(
	string key,
	Object value,
	string op = "="
)