Builder for CommandExecutor & Tokens Refactoring (#508)
* builder for CommandExecutor
* tokens api cleanup, clippy
* fix doctest
* cleanup
* added testcase, remodelled
* command executor builder fix
* fix fuzzer(?)
* implemented From for configurator
* nits
* clippy
* unused
* autotokens
* cleanup
* nits
* Err instead of empty tokens
* fix tokens fn
* fix err
* more error fixing
* tokens remodelling
* typo
* recoverable fail on missing autotokens
* clippy, nostd
* asslice, into_iter, etc. for tokens
* adapt fuzzers
* iter
* fixes, clippy
* fix
* more clippy
* no_std
* more fix
* fixed typo
* cmd_executor builds again
* bring back ASAN stuff to Command Executor
* forkserver speedup
* no need to static
* back to earlier
6810e6085b