Bump Studio to 3.4.0

[dvojtise]

Description

Increase Studio version to 3.4.0.xxx

Update vendor name of all plugins and features to Eclipse GEMOC Project

Changes

-

Contribution to issues

Contribute to https://github.com/eclipse/gemoc-studio/issues/235

Companion Pull Requests

• https://github.com/eclipse/gemoc-studio/pull/236
  • https://github.com/eclipse/gemoc-studio-moccml/pull/20
  • https://github.com/eclipse/gemoc-studio-execution-moccml/pull/55
  • https://github.com/eclipse/gemoc-studio-execution-ale/pull/50
  • https://github.com/eclipse/gemoc-studio-execution-java/pull/20