v0.5.0

This version will include the following updates:

• @morfeo/preset-default: updates to colors, shadows and borders
• @morfeo/hooks: new hook useCurrentTheme (documentation here)
• @morfeo/core: breaking change the the core api:
  1. morfeo.useTheme renamed into morfeo.setCurrentTheme
  2. morfeo.getCurrent renamed into morfeo.getCurrentTheme