record: C# like records for D

[Dylan Graham]

On Wednesday, 14 July 2021 at 23:16:05 UTC, Dylan Graham wrote:
> [DUB](https://code.dlang.org/packages/record)
> [Github](https://github.com/hmmdyl/record)

Found and squashed some critical bugs. Thanks to Adam and Rikki 
for the help.

Before, record would throw a compilation error due when passed 
types declared outside of drecord or its imports. Example:
```D
module myapp;

class A{}
auto MyRecord = record!(get!(A, "a")); // would throw an error as 
it could not find A
```

This was due to improper usage of `.stringof` and mixins. This 
has been corrected and replaced with idiomatic D. The string 
generation functions for the constructor and opEquals have been 
removed and replaced in accordance to above.