Bugfixes and Performance

- better error-messages (especially if nodes are not responding)

- bugfixes in util-functions in wasm
- fixed potential memory leaks in wasm
- added web3ContractAt functions to wasm
- Bugfixes for unescaped JSON-responses in wasm
- added EWC -chain
- added `bootWeitghs`options which fills the weights of the nodes during bootprocess from the bootnodes. This helps to avoid sending requests to unhealthy nodes and boost the first request.
- clean up cmake files
- added attributes (nonull) for better static code analyzes
- refactored sign-interface ( We are using a `in3_sign_ctx_t` now)
- fixed filter-api to support async calls
- removed old memtracker and replaced all tests with valgrind
- fix memory leaks and reduced stack-size to 4k