v0.4.13

• improves CSS Variable creation and management
• base variables get precedence over theme variables when initializing CSS Variables

   const base = {
     colors: {
       blue: 'blue'
     }
   }
  
   const themes = {
     dark: {
       colors: {
         red: 'red'
       }
     }
   }
  
   // creates
   // --theme-colors-blue: blue;
   // --theme-colors-red: initial;