Allow GCI.escapeHTML to take a custom escape table #198

Job	Run time
ruby-versions / Generate Ruby versions	3s
build (2.5 / ubuntu-latest)	22s
build (2.5 / windows-latest)	2m 48s
build (2.6 / ubuntu-latest)	20s
build (2.6 / macos-latest)	28s
build (2.6 / windows-latest)	2m 14s
build (2.7 / ubuntu-latest)	21s
build (2.7 / macos-latest)	26s
build (2.7 / windows-latest)	1m 44s
build (3.0 / ubuntu-latest)	7s
build (3.0 / macos-latest)	10s
build (3.0 / windows-latest)	1m 51s
build (3.1 / ubuntu-latest)	6s
build (3.1 / macos-latest)	12s
build (3.1 / windows-latest)	1m 13s
build (3.2 / ubuntu-latest)	11s
build (3.2 / macos-latest)	14s
build (3.2 / windows-latest)	1m 41s
build (3.3 / ubuntu-latest)	13s
build (3.3 / macos-latest)	11s
build (3.3 / windows-latest)	1m 34s
build (3.4 / ubuntu-latest)	9s
build (3.4 / macos-latest)	18s
build (3.4 / windows-latest)	5m 2s
build (head / ubuntu-latest)	6s
build (head / macos-latest)	16s
build (jruby / ubuntu-latest)	43s
build (jruby-head / ubuntu-latest)	44s
build (truffleruby / ubuntu-latest)	26s
build (truffleruby / macos-latest)	25s
build (truffleruby-head / ubuntu-latest)	31s
build (truffleruby-head / macos-latest)	22s
build (mingw / windows-latest)	2m 42s
build (mswin / windows-latest)	2m 45s
	30m 58s

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