Simple unzip, unrar and zip

12/10/2018

v.2.2a ~ 2018.10
- deprecate armeabi;
- update p7zip to 16.02 version;
- rebuild libs with latest NDK18;
- target is now API 27, min required Android version is API16 (Android 4.1);
- update app drawer with a modern NavigationView;
- minor fixes and improvements.