IEP-1686: Fix for eim download getting stuck (#1387)

* IEP-1686: Fix for eim download getting stuck

* cleaned and better design for eim launch

* fix for welcome page

Author: alirana01

bundles/com.espressif.idf.core/META-INF/MANIFEST.MF

@@ -38,6 +38,7 @@ Export-Package: com.espressif.idf.core,
  com.espressif.idf.core.toolchain,
  com.espressif.idf.core.tools,
  com.espressif.idf.core.tools.exceptions,
+ com.espressif.idf.core.tools.launch,
  com.espressif.idf.core.tools.util,
  com.espressif.idf.core.tools.vo,
  com.espressif.idf.core.tools.watcher,