90 degree corner tracks

[AlexIIL]

Probably with a radii of:

• [ ] 3 blocks?
• [ ] 5 blocks
• [ ] 7 blocks
• [ ] 9 blocks
• [ ] 11 blocks

Also they should be "meta" tracks like points- so they should automatically form and deform when:

• [ ] form when placed to replace half-curves
• [ ] revert back to half-curves when broken