New parser: event-based policy #355

Job	Run time
tabtokens/g++-7/canary/Debug	2m 30s
tabtokens/g++-7/canary/Release	2m 49s
tabtokens/g++-10/canary/Debug	2m 33s
tabtokens/g++-10/canary/Release	3m 36s
tabtokens/g++-5/canary/Debug	2m 15s
tabtokens/g++-5/canary/Release	2m 51s
g++-7/canary/Debug	3m 38s
g++-7/canary/Release	5m 1s
g++-10/canary/Debug	5m 11s
g++-10/canary/Release	6m 14s
g++-5/canary/Debug	3m 43s
g++-5/canary/Release	5m 9s
g++-4.8/canary/Debug	1s
g++-4.8/canary/Release	1s
${{ matrix.cxx }}/extended/${{ matrix.bt }}	1s
	45m 33s

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