move all alloc/free/stop/has/shall_stop*ongoing* methods to context

introduce stop_ongoing to bindings and test for cancelation of configure

deltachat-ffi/src/lib.rs

@@ -1621,7 +1621,7 @@ pub unsafe extern "C" fn dc_stop_ongoing_process(context: *mut dc_context_t) {
     }
     let ffi_context = &*context;
     ffi_context
-        .with_inner(|ctx| configure::dc_stop_ongoing_process(ctx))
+        .with_inner(|ctx| ctx.stop_ongoing())
         .ok();
 }