Move all PREFIX_* constants that have more than 10 members to their own class named PREFIX

[tannergooding]

With this (And the related past couple PRs splitting out "constants"), the follow approx changes exist:

Interop:  11592 Types; 36997 Constants; 6683 Guids; 5721 method imports; 3266 other public static defines (methods/properties)
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DirectX:   2277 Types;   207 Constants;   12 Guids;  117 method imports;  172 other public static defines (methods/properties)
Windows:   9707 Types;  4445 Constants;  228 Guids; 5511 method imports; 2199 other public static defines (methods/properties)
WinRT:      192 Types;     4 Constants;    0 Guids;   93 method imports;   21 other public static defines (methods/properties)

Where Types is the number of types in the given namespace; the rest are the number of members in the respective static class with the DLL imports. This brings the largest class (static class Windows) down to 12383 members out of the 52667 original members; or ~24% of the original size.