Adds Composite Weather Device Type

v0.8.24

• Adds precipitation bar chart option for composite forecast devices.
• Adds min/max settings for composite weather device elements.
• Changes device type name for composite forecast devices.
• Reorders plot elements list for composite forecast device.
• Enables validation for composite forecast device.
• Code refinements.

v0.8.23

• Adds Composite Weather Device type.
• Fixes bug in selection menu for date format (DD MMM) which was improperly
  defined.

v0.8.22

• Adds lines to Area Chart device.