load universe only when all plugins are available - fixes #490; universe file does not depend on the order of plugins
load universe only when all plugins are available - fixes #490; universe file does not depend on the order of plugins

zhouxh1023/LumixEngine,dreamsxin/LuxEngine,galek/LumixEngine,galek/LumixEngine,zhouxh1023/LumixEngine,gamedevforks/LumixEngine,JakubLukas/LumixEngine,JakubLukas/LumixEngine,gamedevforks/LumixEngine,dreamsxin/LuxEngine,JakubLukas/LumixEngine