[CGMZ] Core - Version 1.20.0

Hi all, today this plugin was updated to version 1.20.0!

This update adds a function for drawing selectable window backgrounds, which has become quite a common feature across [CGMZ] plugins so will surely be used quite soon.

This update also added a function for loading face images before they are drawn, and a function to get a random number within a given range.

Note: Core updates should be very quick and easy to do, so it is recommended to keep [CGMZ] Core up to date. All you need to do is paste the new .js file over the old .js file. Not updating the Core will lead to crashes as plugins are updated to use these new functions which won't exist in older versions of the Core.

• Added function to load a face image before drawing it
• Added functions for drawing selectable/command backgrounds
• Added function to get random number within a range