Removed generic json output support and only add it for the help operation

src/main/resources/templates/bld/executor_error.json

@@ -1,3 +0,0 @@
-{
-  "error": "{{v error-message/}}"
-}

src/main/resources/templates/bld/executor_execute.json

@@ -1,8 +0,0 @@
-{
-  "commands": {{{v commands}}{{/v}}{{b command}}{{v separator/}}
-    "{{v command/}}": {
-      "out": "{{v out/}}",
-      "err": "{{v err/}}"
-    }{{/b}}
-  }
-}