schema: rm _composedModule abstraction

- that abstraction was mostly obsolete
- the only remaining 'composed-module' was Fx,
  simply merge its attribute into base layout attributes.

Author: etpinard

Diff for: src/plots/cartesian/graph_interact.js

@@ -23,6 +23,7 @@ var dragElement = require('../../components/dragelement');
 var Axes = require('./axes');
 var constants = require('./constants');
 var dragBox = require('./dragbox');
+var layoutAttributes = require('../layout_attributes');
 
 
 var fx = module.exports = {};
@@ -32,29 +33,12 @@ var fx = module.exports = {};
 fx.unhover = dragElement.unhover;
 
 fx.layoutAttributes = {
-    dragmode: {
-        valType: 'enumerated',
-        role: 'info',
-        values: ['zoom', 'pan', 'select', 'lasso', 'orbit', 'turntable'],
-        dflt: 'zoom',
-        description: [
-            'Determines the mode of drag interactions.',
-            '*select* and *lasso* apply only to scatter traces with',
-            'markers or text. *orbit* and *turntable* apply only to',
-            '3D scenes.'
-        ].join(' ')
-    },
-    hovermode: {
-        valType: 'enumerated',
-        role: 'info',
-        values: ['x', 'y', 'closest', false],
-        description: 'Determines the mode of hover interactions.'
-    }
 };
 
 fx.supplyLayoutDefaults = function(layoutIn, layoutOut, fullData) {
+
     function coerce(attr, dflt) {
-        return Lib.coerce(layoutIn, layoutOut, fx.layoutAttributes, attr, dflt);
+        return Lib.coerce(layoutIn, layoutOut, layoutAttributes, attr, dflt);
     }
 
     coerce('dragmode');

Diff for: src/plots/layout_attributes.js

@@ -171,9 +171,23 @@ module.exports = {
         description: 'Determines whether or not a legend is drawn.'
     },
 
-    _composedModules: {
-        '*': 'Fx'
+    dragmode: {
+        valType: 'enumerated',
+        role: 'info',
+        values: ['zoom', 'pan', 'select', 'lasso', 'orbit', 'turntable'],
+        dflt: 'zoom',
+        description: [
+            'Determines the mode of drag interactions.',
+            '*select* and *lasso* apply only to scatter traces with',
+            'markers or text. *orbit* and *turntable* apply only to',
+            '3D scenes.'
+        ].join(' ')
     },
+    hovermode: {
+        valType: 'enumerated',
+        role: 'info',
+        values: ['x', 'y', 'closest', false],
+        description: 'Determines the mode of hover interactions.'
 
     _nestedModules: {
         'xaxis': 'Axes',