8ee1744b9b Make 'use core::fmt' calls consistent (Shing Him Ng)
Pull request description:
I started taking a look at #2869 and looked for everything that was implementing the `Display` trait:
```rust
impl fmt::Display for _
```
but found some places where the imports weren't consistent:
```rust
impl Display for _
```
There were only a few instances of the latter, so I went ahead and cleaned those up before starting #2869
I started pulling this thread when I saw the same thing was happening for `fmt::Debug` and `fmt::Formatter` so I updated the rest of the `use core::fmt::*` statements with a few exceptions:
- No updates to `use core::fmt::*` if it was being called from within a function since I felt like the function scope was small enough to not cause confusion
- No updates to `use core::fmt::{self, Write as _};`
ACKs for top commit:
Kixunil:
ACK 8ee1744b9b
tcharding:
ACK 8ee1744b9b
Tree-SHA512: 33eb6ea0c4e808ef78bc87de6547144b756bde206c50d80488f740e97cd8d11f1abcb8936c487d7bfd29be5e21c7f40ff88f82acdaaec9aacb4b6362ffc4c680