[WIP, DNM] Initial map conversion of Cynosure.

Opening this for visibility and tracking over time, please do not merge. Ports the Cynosure from main Polaris.

TODO

[X] Get cynosure-1.dmm to compile.
[ ] Get cynosure-2.dmm to compile.
[ ] Get cynosure-3.dmm to compile.
[ ] Get cynosure-4.dmm to compile.
[ ] Get cynosure-5.dmm to compile.
[ ] Get cynosure-6.dmm to compile.
[ ] Get cynosure-7.dmm to compile.
[ ] Get the submaps to compile.
[ ] Add level data objects to replace Polaris versions.
[ ] Update turbolifts and shuttles.
[ ] Update airlocks and buttons.
[ ] Replace natural grass/wildgrass turfs with Sif turfs from maps/southern_cross branch.
[ ] Port Sivian flora from maps/southern_cross branch.
[ ] Separate cynosure_todo.dm into system ports, content ports, and Neb-compatible expansions.
[ ] Action content ports.
[ ] Action expansions.