cellSail fixes and GetRegBySPR split up

* Fixed cellSailPlayerAddDescriptor
* Fixed cellSailDescriptorSetAutoSelection
* Fixed cellSailDescriptorIsAutoSelection
* Split GetRegBySPR into ReadSPR and WriteSPR
* Added 0x10c for ReadSPR and WriteSPR (Time-based register)
Merge pull request #862 from tambry/Fixes

cellSail fixes, split GetRegBySPR into ReadSPR and WriteSPR, added 0x10c case for them