Fix Runtime.Trigger and Transaction.GetType syscalls

[ixje]

What current issue(s) does this address, or what feature is it adding?
The ongoing audit showed a deviation in gas consumption for Testnet block 449841.
Both RunTime.Trigger and Transaction.GetType are supposed to push integers to the stack, neo-python pushed bytes. For the majority of time this worked well, but the mentioned block showed a contract where a NUMEQUAL instruction would fail the comparison in neo-python whereas neo-cli passed. This caused the next instruction JMPIFNOT to take a different branch and the rest is history.

How did you solve this problem?
pushing int's instead of bytes.

How did you make sure your solution works?
audit of the block now passes (=gas consumption equals neo-cli)

Are there any special changes in the code that we should be aware of?
no

Please check the following, if applicable:

• Did you add any tests?
• Did you run make lint?
• Did you run make test?
• Are you making a PR to a feature branch or development rather than master?
• Did you add an entry to CHANGELOG.rst? (if not, please do)

[coveralls]

Coverage remained the same at 85.095% when pulling 8b4b894 on ixje:fix-trigger-txtype into 9d3b4a0 on CityOfZion:development.