Update no-panics lint to perform checks by itself, removing the dependency on clippy

[KaiserKarel]

Currently the no-panics lint checks that clippy has been configured in a way to deny all panics. That creates a bit of boilerplatey noise, as we add the same attributes at the top of each crate. We instead want to import the no-panics related lints from clippy and register them in substrace, so that we can avoid checking for existing attributes and instead perform the checks ourselves.

Currently the lints that we want to import are:

• disallowed_methods
• indexing_slicing
• todo
• unwrap_used
• panic

If possible, we'd like to still allow these in code when compiling under cfg(test), but if that cannot be easily implemented, not needed.

[TheCodingWombat]

Gauging how hard this is gonna be:

• For panic and todo a simple LateLintPass as in clippy_lints/src/panic_unimplemented.rs
• For unwrap_used, look at clippy_lints/src/methods/mod.rs
• For indexing_slicing, look at clippy_lints/src/indexing_slicing.rs
• For disallowed_methods, look at clippy_lints/src/disallowed_methods.rs

[TheCodingWombat]

Idea: Submodule and autocopy with shell script

Idea: Enforce to run Clippy from within Substrace with deny panic etc.

[TheCodingWombat]

Concensus: Add submodules. Register clippy lints in substrace.

Or create proc macro that gets expanded to the cluttered 5 clippy things.