Lua: GetMasserPhase and GetSecundaPhase equivalent
I'm working on several mods which implement different mechanics for phases of the moons. One is a UI mod and one is a gameplay mod. However, there is no equivalent of the mwscript functions: `GetMasserPhase` and `GetSecundaPhase`, so the only option is to create an .esp with an mwscript and send global variables back and forth, or hardcoding phases of the moons to dates which might not even be accurate.
This would also be helpful if someone wanted to bring the MWSE mod [Windows to Aetherius](https://www.nexusmods.com/morrowind/mods/52941) to OpenMW.
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