…vention

This does not change the APIs yet, as we need Swift struct lowering support in Mono before we can switch to using more structured Swift types.

This PR switches the entry-points on the C side to use non-method symbols as we'll lose the ability to represent the Swift signatures well in C as we move to a more Swift-friendly API surface (until we are able to remove the native PAL API surface)

…ress-of operation explicit in the DllImportEntry macro.

…ll is added to Mono) instead of using DllImportEntry, which now takes an address

Co-authored-by: Aleksey Kliger (λgeek) <akliger@gmail.com>