tests: Add more tests for viper, including tests for ViperTypeError's.

tests/micropython/viper_cond.py

tests/micropython/viper_cond.py.exp

tests/micropython/viper_error.py

tests/micropython/viper_error.py.exp

tests/micropython/viper_misc.py

tests/micropython/viper_misc.py.exp

tests/micropython/viper_ptr16_load.py

tests/micropython/viper_ptr16_load.py.exp

tests/micropython/viper_ptr8_load.py

tests/micropython/viper_ptr8_load.py.exp

tests/micropython/viper_ptr8_store.py

tests/micropython/viper_ptr8_store.py.exp