Fixed class lifetimes

mist-test/src/core/mod.mist

@@ -1,5 +0,0 @@
-mod app;
-mod task;
-mod plugin;
-mod logger;
-mod event;

mist-test/src/main.mist

@@ -1,6 +1,10 @@
-mod core;
+mod app;
+mod task;
+mod plugin;
+mod logger;
+mod event;
 
-use <core::app>;
+use <app>;
 // use <plugins::greeting>;
 // use <plugins::statistics>;