This commit makes the user-facing StdLibExtras templates and utilities
arguably more nice-looking by removing the need to reach into the
wrapper structs generated by them to get the value/type needed.
The C++ standard library had to invent `_v` and `_t` variants (likely
because of backwards compat), but we don't need to cater to any codebase
except our own, so might as well have good things for free. :^)
This change introduces `AK_ENUM_BITWISE_OPERATORS(..)` which when
enabled for an enum, will automatically declare all the necessary
bitwise operators for that enum.
This allows bit masks enums to be used as first class, type safe, citizens.
