Suggestions regarding time dependance about mm-rando

[TheRealC]

After a clarification of what role "Needed on" serves, this part of the suggestion has been removed. At the same time, I would like to suggest renaming "Needed on" to something more indicative of its actual purpose, e.g. "Must be available on".

E.g.: in the latest Casual logic, Letter to Mama is currently set as "Needed on: Day 3", which is a good choice to ensure it is available exactly when needed, but makes little intuitive sense, as it has no usage on Day 3. "Must be available on: Day 3" is significantly clearer, for the sake of future logic editors. "Must be available on at least one of: (...)" is even more precise, for items that have a range of times they can be placed on, although it is admittedly rather lengthy.