Hard forks application fixes in the converter

Closes #261 (closed), #253 (closed)

• Fixed hard forks application in the converter (hard forks were previously applied one block before they should be actually applied)
• Hardcoded mainnet hard fork application block numbers in the hive/protocol/hardfork_block.hpp header file
• Fixed members initialization order in the converter causing compiler warnings
• Optimized hard forks application in the converter by replacing if/if else's chain by the statically declared array of "hard fork applies" (it could be even customized in the future)
• Fixed chain id validation in the block log conversion plugin after HF20