Contract deployment - stage 1

[mbenke]

Adds basic contract deployment code (no constructors or dispatch yet).

Testing example
Assuming running node & PRIVATE_KEY set:

$ cabal exec sol-core -- -f test/examples/spec/00answer.solc 
Emitting core for contract Answer
Writing to output1.core

$ cabal exec yule -- output1.core -o Answer.yul
found main
writing output to Answer.yul

$ hex=$(solc --strict-assembly --bin --optimize --optimize-yul Answer.yul | tail -1)

$ rawtx=$(cast mktx --private-key=$PRIVATE_KEY --create $hex)

$ cast publish $rawtx | jq .contractAddress
"0x5fc8d32690cc91d4c39d9d3abcbd16989f875707"

ben@grab:~/work/solcore$ cast call 0x5fc8d32690cc91d4c39d9d3abcbd16989f875707
0x000000000000000000000000000000000000000000000000000000000000002a