v0.12.0

Features:

• Modifiable line color.
• Delete button in context menu.
• Delete object/s using "DELETE" key.

Fix:

• Clear circle color pickers when object properties window is closed.

Styles:

• UI for line properties.
• Add shadow to context menu, add margin to group utilities.
• Add horizontal padding for context menu and increase icon size.
• Design for context menu delete button.