v3.0.4: Prepare Rust

-bugfixes and optimization exceptionhandling python (https://github.com/blockchainsllc/in3-c/pull/19)
- rename btc_targetProof
- support for `eth_sendTransactionAndWait` in dotnet
- bug fixing overlfowbug in subrequest
- bugfix wasm: fullsupport for chain-namesinstead of chainIds
- add optional jsonparser using indexed propertynames