Add windows-rs format

[merlinz01]

Add a format for GUIDs for the windows Rust crate, like so:

// {f4666fdb-ad36-4d5f-99d6-80c83492f58d}
const __NAME__: GUID = GUID {data1: 0xf4666fdb, data2: 0xad36, data3: 0x4d5f, data4: [0x99, 0xd6, 0x80, 0xc8, 0x34, 0x92, 0xf5, 0x8d]};

[heaths]

Thank you for the contribution; however, I don't want to start adding overly-specific use cases now that custom formatting is possible. This is likely only specific to Rust - a single language out of nearly countless - and may only be specific to the windows crate or others that are similar. Other GUID implementations might have data0..data3, for example.

That said, the custom formatting won't work for your case, but what might work better is to add custom format specifiers for the constituent parts of a GUID, namely the first i32, second and third i16s, and 4th [u8; 8] that would allow you to add a format to your settings to insert e.g.,

'const _PLACEHOLDER_: GUID = GUID {data1: {x0}, data2: {x1}, data3: {x2}, data4: [{x3,}]};'

Where x[0..4] all return hex-encoded data based on a GUID and, in this example (maybe it's unnecessary), x3, has a comma as the separator. It's likely a different separator wouldn't be necessary, though.

[merlinz01]

See #85 for an implementation of your suggestion. I hadn't even seen the option for custom formatting before you pointed it out.