Tests

Added checks for invalid usage of continue/break/return in except* bl… #34

Job	Run time
Test mypyc suite with 32-bit Python	7m 20s
Test suite with py38-ubuntu, mypyc-compiled	18m 31s
Test suite with py38-windows-64	21m 10s
Test suite with py39-ubuntu	17m 41s
Test suite with py310-ubuntu	17m 24s
Test suite with py311-ubuntu, mypyc-compiled	16m 25s
Test suite with py312-ubuntu, mypyc-compiled	18m 40s
Test suite with py313-ubuntu, mypyc-compiled	19m 11s
mypyc runtime tests with py39-macos	4m 13s
Type check our own code (py38-ubuntu)	1m 50s
Type check our own code (py38-windows-64)	2m 53s
Formatting and code style with Black + ruff	1m 9s
	2h 26m 27s

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