Declare json global for luacheck

Author: gajop

.luacheckrc

@@ -60,12 +60,12 @@ globals = {
     -- Widgets
     "WG", "widgetHandler", "widget",
     -- Libs
-    "LCS", "Path", "Table", "Log", "String", "Shaders", "Time", "Array", "StartScript",
+    "LCS", "Path", "Table", "Log", "String", "Shaders", "Time", "Array", "StartScript", "json",
     -- SB speciifc
     "SB", "gfx",
 
     -- SB view fields
     "UnitField", "FeatureField", "AreaField", "TriggerField", "UnitTypeField", "FeatureTypeField",
     "TeamField", "NumericField", "StringField", "BooleanField", "NumericComparisonField", "IdentityComparisonField",
     "PositionField"
-}
+}