If user code has a type alias (or custom type) called `Result` or
`Option` etc, this would be used instead of the intended standard
library types causing surprising compile errors from generated code.
Using the fully qualified path allows the generated code to be isolated
from user types.
Includes two basic regression tests covering `Result` and `Send`.
Fixes#1194
- remove `cargo-make` integration
- rework CI pipeline more granular and precise
- rework releasing process
- tune up project layout
- fill up new CHANGELOGs
Additionally:
- fix latest nightly/stable Rust inconsistencies
