v3.4.0

• feat: add before_first_request hook to hep
• feat: errhandler allow exception
• feat: emit_assets add _raw param
• feat: filter allow [f1, f2, (name, f3)]
• feat: web manager add a button, select language
• feat: stpl alow asc or desc, open the template sorting
• fix: check getPluginClass
• fix: check url prefix
• chore: update docs, example and test case