Time study planner

How this works: the planner runs a port of the game's own study tree code on the game's 62 time studies and 12 Eternity Challenge studies. It reads an import string the way the game does (study numbers, ranges such as 11-62, path names such as "antimatter" or "idle", and "|5" or "|5!" for an Eternity Challenge), then goes through the studies in the order you wrote them and buys each one whose requirements hold at that point: the studies before it, one dimension path (two after Time Study 201, three with the Dilation upgrade), Space Theorems for a second pick in the pace and light/dark splits, and for the Eternity Challenge study its Time Theorem cost, its entry goal and the studies that block it. A study written before the one it needs is skipped, just as in the game. What the game reads from your save is in "Your save": set it to match yours. We checked the planner against the game's published code on 7,000 trees and save states; every purchase list, cost and export string matched.