icon2html optimizations #16209

Job	Run time
Compile Maps	1m 45s
Windows Build	4m 19s
Run Linters	1m 51s
Find Maps to Test	19s
Unit Tests (bigredv2) / run_unit_tests	6m 11s
Unit Tests (corsat) / run_unit_tests	6m 52s
Alternate Tests (515, 1610, lv624) / run_unit_tests	6m 9s
Unit Tests (almayer) / run_unit_tests	6m 20s
Unit Tests (chinook) / run_unit_tests	6m 13s
Unit Tests (fiorina_sciannex) / run_unit_tests	6m 15s
Unit Tests (desert_dam) / run_unit_tests	6m 19s
Unit Tests (ice_colony_v2) / run_unit_tests	6m 14s
Unit Tests (lv522_chances_claim) / run_unit_tests	6m 13s
Unit Tests (kutjevo) / run_unit_tests	6m 13s
Unit Tests (lv624) / run_unit_tests	6m 24s
Unit Tests (runtime) / run_unit_tests	6m 45s
Unit Tests (new_varadero) / run_unit_tests	6m 35s
Unit Tests (shivas_snowball) / run_unit_tests	6m 3s
Unit Tests (prison_station_fop) / run_unit_tests	6m 27s
Unit Tests (sorokyne_strata) / run_unit_tests	6m 56s
Unit Tests (whiskey_outpost_v2) / run_unit_tests	5m 59s
Check Alternate Tests	1s
	1h 56m 23s

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