* Adds shield diffusers and modifies shields
* Addresses my own review comments on original PR.
* Linter error.
* Diffuser code tidying + improvement.
* Matt's review comment, missing leading /
Co-authored-by: TGW <mc-casper@hotmail.dk>
Fixes#3096 which exists because T != U.
Fixes#3461 which exists because I should read the code I'm refactoring instead of getting carried away by RANGE_TURFS being faster.
Fixes#2803Fixes#2553Fixes#2597 (Couldn't find a cleaner way to make this work, unfortunately. Not all procs-as-verbs can be used as procs.)
Fixes#2498Fixes#2912