Add font size support on title bar for android (#1493)

* Add font family support on bottom tabs

* import missing classes

* import missing class

* update document

* Support customize icon for left nav button in android

* Add navBar navBarTextFontSize support for android

android/app/src/main/java/com/reactnativenavigation/params/StyleParams.java

     public Color titleBarButtonColor;
     public Color titleBarDisabledButtonColor;
     public Font titleBarTitleFont;
+    public int titleBarTitleFontSize;
     public boolean titleBarTitleTextCentered;
     public boolean backButtonHidden;
 

android/app/src/main/java/com/reactnativenavigation/params/parsers/StyleParamsParser.java

         result.titleBarButtonColor = getColor("titleBarButtonColor", getTitleBarButtonColor());
         result.titleBarDisabledButtonColor = getColor("titleBarDisabledButtonColor", getTitleBarDisabledButtonColor());
         result.titleBarTitleFont = getFont("titleBarTitleFontFamily", getDefaultTitleTextFontFamily());
+        result.titleBarTitleFontSize = getInt("titleBarTitleFontSize", getDefaultTitleTextFontSize());
         result.titleBarTitleTextCentered = getBoolean("titleBarTitleTextCentered", getDefaultTitleBarTextCentered());
         result.backButtonHidden = getBoolean("backButtonHidden", getDefaultBackButtonHidden());
         result.topTabsHidden = getBoolean("topTabsHidden", getDefaultTopTabsHidden());
         return AppStyle.appStyle == null ? new StyleParams.Font() : AppStyle.appStyle.titleBarTitleFont;
     }
 
+    private int getDefaultTitleTextFontSize() {
+        return AppStyle.appStyle == null ? -1 : AppStyle.appStyle.titleBarTitleFontSize;
+    }
+
     private boolean getDefaultTitleBarTextCentered() {
         return AppStyle.appStyle != null && AppStyle.appStyle.titleBarTitleTextCentered;
     }

android/app/src/main/java/com/reactnativenavigation/views/TitleBar.java

         setVisibility(params.titleBarHidden);
         setTitleTextColor(params);
         setTitleTextFont(params);
+        setTitleTextFontSize(params);
         setSubtitleTextColor(params);
         colorOverflowButton(params);
         setBackground(params);
         }
     }
 
+    protected void setTitleTextFontSize(StyleParams params) {
+        if (params.titleBarTitleFontSize == -1) {
+            return;
+        }
+        View titleView = getTitleView();
+        if (titleView instanceof TextView) {
+            ((TextView) titleView).setTextSize(((float) params.titleBarTitleFontSize));
+        }
+    }
+
     protected void setSubtitleTextColor(StyleParams params) {
         if (params.titleBarSubtitleColor.hasColor()) {
             setSubtitleTextColor(params.titleBarSubtitleColor.getColor());

src/deprecated/platformSpecificDeprecated.android.js

     titleBarButtonColor: processColor(originalStyleObject.navBarButtonColor),
     titleBarDisabledButtonColor: processColor(originalStyleObject.titleBarDisabledButtonColor),
     titleBarTitleFontFamily: originalStyleObject.navBarTextFontFamily,
+    titleBarTitleFontSize: originalStyleObject.navBarTextFontSize,
     titleBarTitleTextCentered: originalStyleObject.navBarTitleTextCentered,
     backButtonHidden: originalStyleObject.backButtonHidden,
     topTabsHidden: originalStyleObject.topTabsHidden,