Port v1.2.4 and v1.2.5

Improvements to get account (chain_plugin and cleos) related to core_symbol

cleos improvements: disambiguate symbol_code in to_asset cache using contract name; efficiency improvements related to --pay-ram-to-open option

fix core_symbol issues with get account; also print out account creation time during cleos get account

Add cleos support `open` token balance row before transfer

Fix Utils.processCmd method output

delete contents inside state directory but not the directory itself

Add filter-on ability to accept blank action as wildcard

Add deprecation notice to eosiocpp

Build secp256k1 as a submodule

Implement Trusted Producer Light Validation

abi_def: don't default version

(appbase sync) disallow unknown configs in config.ini

fix bugs in abi_serializer variant to binary

Moved trusted_producer_light_validation flag out of config to impl and added trusted_producer to reflection macro. GH #5268

Breakout the non-parallelizable tests in to their own buildkite unit so they can easily be run simultaneously with the other parallelizable ones.

Add a new WASM backend: wabt