more chain test fixes

fixes for wasm memory tests

the removal of `init` from `setcode` moved compilation AND validation of wasm to the first action.  We should do validation during `setcode` but doing this properly requires additional work.  This is a temporary fix

Additionally, the injector code was failing when hit with hand crafted wasm that had no types/import section(s)

Master bta 1307

Fix proxy contract for new eosio.system account

DAWN-512 - Improve eosioc error message

initalize sbrk_bytes based on initial memory size of wasm memory

Added commas to make genesis.json valid JSON

Add more constraints on WASM execution environment

Fix chaintest

add more crypto apis to wasm interface

add parameter for tester construction to indicate whether it should push the genesis/funding transactions.  Setting this to false creates a testr that can be fed those transactions in a block.