Adds a 'slot nickname' field for easily ID'ing chara slots #2667

Job	Run time
Compile Maps	27s
Lint with OpenDream	21s
Find Maps to Test	9s
Run Linters	1m 6s
Windows Build	50s
Alternate Tests	0s
Check Alternate Tests	0s
Unit Tests (chapaev) / run_unit_tests	46s
Unit Tests (bigredv2) / run_unit_tests	48s
Unit Tests (almayer) / run_unit_tests	48s
Unit Tests (chinook) / run_unit_tests	49s
Unit Tests (derelict_almayer) / run_unit_tests	1m 11s
Unit Tests (corsat) / run_unit_tests	46s
Unit Tests (desert_dam) / run_unit_tests	43s
Unit Tests (fiorina_sciannex) / run_unit_tests	43s
Unit Tests (golden_arrow) / run_unit_tests	42s
Unit Tests (golden_arrow_classic) / run_unit_tests	50s
Unit Tests (ice_colony_v1) / run_unit_tests	57s
Unit Tests (ice_colony_v2) / run_unit_tests	48s
Unit Tests (kutjevo) / run_unit_tests	58s
Unit Tests (lv522_chances_claim) / run_unit_tests	44s
Unit Tests (lv624_repaired) / run_unit_tests	39s
Unit Tests (new_varadero) / run_unit_tests	39s
Unit Tests (lv624) / run_unit_tests	42s
Unit Tests (new_varadero_repaired) / run_unit_tests	45s
Unit Tests (prison_station_fop) / run_unit_tests	32s
Unit Tests (runtime) / run_unit_tests	25s
Unit Tests (runtime_multiz) / run_unit_tests	25s
Unit Tests (rover) / run_unit_tests	31s
Unit Tests (shivas_snowball) / run_unit_tests	32s
Unit Tests (sorokyne_strata) / run_unit_tests	24s
Unit Tests (whiskey_outpost_v2) / run_unit_tests	24s
	20m 24s

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