Allow win naming conventions in ENUM! and STRUCT!

[Madoshakalaka]

Currently the ENUM! and STRUCT! macros generate a lot of lint warnings, here's an example taken from some code I am writing:

winapi::ENUM! {
    enum STORAGE_BUS_TYPE{
      BusTypeUnknown = 0,
      BusTypeScsi = 1,
      BusTypeAtapi = 2,
      BusTypeAta = 3,
      BusType1394 = 4 ,
      BusTypeSsa = 5,
      BusTypeFibre = 6,
      BusTypeUsb = 7,
      BusTypeRAID = 8,
      BusTypeiScsi = 9,
      BusTypeSas = 10,
      BusTypeSata = 11,
      BusTypeSd = 12,
      BusTypeMmc = 13,
      BusTypeVirtual = 14,
      BusTypeFileBackedVirtual = 15,
      BusTypeSpaces = 16,
      BusTypeNvme = 17,
      BusTypeSCM = 18,
      BusTypeUfs = 19,
      BusTypeMax = 20,
      BusTypeMaxReserved = 21,
    }
}

winapi::STRUCT! {
    #[derive(Debug)]
    struct STORAGE_DEVICE_DESCRIPTOR {
        Version: DWORD,
        Size: DWORD,
        DeviceType: BYTE,
        DeviceTypeModifier: BYTE,
        RemovableMedia: BOOLEAN,
        CommandQueueing: BOOLEAN,
        VendorIdOffset: DWORD,
        ProductIdOffset: DWORD,
        ProductRevisionOffset: DWORD,
        SerialNumberOffset: DWORD,
        BusType: STORAGE_BUS_TYPE,
        RawPropertiesLength: DWORD,
        RawDeviceProperties: [BYTE; 1],
    }
}

cargo build output:

This PR adds #[allow(non_camel_case_types)], #[allow(non_upper_case_globals)] and #[allow(non_snake_case)] to suppress
type const and struct field naming conflicts respectively.

[Madoshakalaka]

macro names should be in lowercase too. maybe it's more fitting to name this macro win_enum or c_enum

[Madoshakalaka]

same, could name it win_struct or c_struct?