icon2html optimizations #16475

Job	Run time
Compile Maps	1m 26s
Find Maps to Test	14s
Run Linters	1m 46s
Windows Build	3m 56s
Unit Tests (bigredv2) / run_unit_tests	6m 9s
Unit Tests (almayer) / run_unit_tests	6m 50s
Unit Tests (chinook) / run_unit_tests	6m 4s
Unit Tests (corsat) / run_unit_tests	6m 12s
Unit Tests (desert_dam) / run_unit_tests	6m 17s
Unit Tests (fiorina_sciannex) / run_unit_tests	6m 7s
Unit Tests (ice_colony_v2) / run_unit_tests	6m 27s
Unit Tests (kutjevo) / run_unit_tests	6m 5s
Unit Tests (lv522_chances_claim) / run_unit_tests	6m 42s
Unit Tests (lv624) / run_unit_tests	6m 8s
Unit Tests (new_varadero) / run_unit_tests	6m 9s
Unit Tests (prison_station_fop) / run_unit_tests	6m 26s
Unit Tests (runtime) / run_unit_tests	6m 9s
Unit Tests (sorokyne_strata) / run_unit_tests	6m 26s
Unit Tests (shivas_snowball) / run_unit_tests	6m 20s
Unit Tests (whiskey_outpost_v2) / run_unit_tests	6m 40s
Alternate Tests (515, 1610, lv624) / run_unit_tests	5m 58s
Check Alternate Tests	1s
	1h 54m 32s

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