gui: menu to advance plate simulation step by step
gui: menu to advance plate simulation step by step

Former-commit-id: a0e2e3c0f94f5828e502e156f8ab9cb254da95dd
Mindwerks/worldengine,sylvanmist/worldengine,tmfoltz/worldengine,sylvanmist/worldengine,Mindwerks/worldengine,MM1nd/worldengine,psi29a/worldengine,esampson/worldengine,psi29a/worldengine,MM1nd/worldengine,esampson/worldengine,tmfoltz/worldengine