Cut down on macro nonsense

- InertAtomic replaced atomic_inert! for improved tooling support
- atomic_defaults! is easier to type out than to explain in a docstring
- Changed rustfmt config to better support tiny functions such as as_any

rustfmt.toml

@@ -13,6 +13,7 @@ normalize_comments = true
 wrap_comments = true
 overflow_delimited_expr = true
 use_small_heuristics = "Max"
+fn_single_line = true
 
 # literals
 hex_literal_case = "Lower"
@@ -30,4 +31,4 @@ use_try_shorthand = true
 # Modules
 group_imports = "StdExternalCrate"
 imports_granularity = "Module"
-reorder_modules = true
+reorder_modules = true