Add fab.iconColor option

Closes #3664

lib/android/app/src/main/java/com/reactnativenavigation/parse/FabOptions.java

         if (json.has("icon")) {
             options.icon = TextParser.parse(json.optJSONObject("icon"), "uri");
         }
+        options.iconColor = ColorParser.parse(json, "iconColor");
         if (json.has("actions")) {
             JSONArray fabsArray = json.optJSONArray("actions");
             for (int i = 0; i < fabsArray.length(); i++) {
     public Colour clickColor = new NullColor();
     public Colour rippleColor = new NullColor();
     public Text icon = new NullText();
+    public Colour iconColor = new NullColor();
     public Bool visible = new NullBool();
     public ArrayList<FabOptions> actionsArray = new ArrayList<>();
     public Text alignHorizontally = new NullText();
         if (other.icon.hasValue()) {
             icon = other.icon;
         }
+        if (other.iconColor.hasValue()) {
+            iconColor = other.iconColor;
+        }
         if (other.actionsArray.size() > 0) {
             actionsArray = other.actionsArray;
         }
         if (!icon.hasValue()) {
             icon = defaultOptions.icon;
         }
+        if (!iconColor.hasValue()) {
+            iconColor = defaultOptions.iconColor;
+        }
         if (actionsArray.size() == 0) {
             actionsArray = defaultOptions.actionsArray;
         }

lib/android/app/src/main/java/com/reactnativenavigation/presentation/FabPresenter.java

             fab.setColorRipple(options.rippleColor.get());
         }
         if (options.icon.hasValue()) {
-            fab.applyIcon(options.icon.get());
+            fab.applyIcon(options.icon.get(), options.iconColor);
         }
         if (options.size.hasValue()) {
             fab.setButtonSize("mini".equals(options.size.get()) ? SIZE_MINI : SIZE_NORMAL);
             fab.setColorRipple(options.rippleColor.get());
         }
         if (options.icon.hasValue()) {
-            fab.applyIcon(options.icon.get());
+            fab.applyIcon(options.icon.get(), options.iconColor);
         }
         if (options.size.hasValue()) {
             fab.setButtonSize("mini".equals(options.size.get()) ? SIZE_MINI : SIZE_NORMAL);

lib/android/app/src/main/java/com/reactnativenavigation/views/Fab.java

 package com.reactnativenavigation.views;
 
 import android.content.Context;
+import android.graphics.PorterDuff;
+import android.graphics.PorterDuffColorFilter;
 import android.graphics.drawable.Drawable;
 import android.support.annotation.NonNull;
 
 import com.reactnativenavigation.anim.FabAnimator;
 import com.reactnativenavigation.anim.FabCollapseBehaviour;
 import com.reactnativenavigation.interfaces.ScrollEventListener;
+import com.reactnativenavigation.parse.params.Colour;
 import com.reactnativenavigation.utils.ImageLoader;
 import com.reactnativenavigation.utils.ImageLoadingListenerAdapter;
 
         this.id = id;
     }
 
-    public void applyIcon(String icon) {
+    public void applyIcon(String icon, Colour color) {
         new ImageLoader().loadIcons(getContext(), Collections.singletonList(icon), new ImageLoadingListenerAdapter() {
             @Override
             public void onComplete(@NonNull List<Drawable> drawables) {
+                if (color.hasValue()) drawables.get(0).setColorFilter(new PorterDuffColorFilter(color.get(), PorterDuff.Mode.SRC_IN));
                 setImageDrawable(drawables.get(0));
             }
 

lib/src/interfaces/Options.ts

   elevation?: AndroidDensityNumber;
 }
 
+export interface OptionsFab {
+  id: string;
+  backgroundColor?: Color;
+  clickColor?: Color;
+  rippleColor?: Color;
+  visible?: boolean;
+  icon?: ImageRequireSource;
+  iconColor?: Color;
+  alignHorizontally?: 'left' | 'right';
+  alignVertically?: 'top' | 'bottom';
+  hideOnScroll?: boolean;
+  size?: number;
+  actions?: OptionsFab[];
+}
+
 export interface OptionsBottomTabs {
   /**
    * Show or hide the bottom tabs
    * Configure the top bar
    */
   topBar?: OptionsTopBar;
+  fab?: OptionsFab;
   /**
    * Configure the bottom tabs
    */