Define custom indicators

[newwby]

• Attach script to indicator sprite nodes with custom exports
• Use trailing affixes on the add_to_indicator_overlay grouping string to determine chosen indicator node
• Create metagroup from different indicator grouping strings at _process/runtime
• Update object pooling to handle multiple indicator node types
• Add indicator sprite node property: groupstring
• Add indicator sprite node property: edge offset (override constant)
• Add indicator sprite node property: is_rotating (override constant)