Provide libboincapi as a DLL

[AlbertStrasheim]

It would be very useful if libboincapi were available as a DLL. It seems that this should make it very easy to write BOINC client applications in C# or other .NET languages using .NET's DllImport? feature.

Preliminary patch and VS project file is attached. There are still a few issues that someone more knowledgeable might tackle:

• boinc_resolve_filename is defined in multiple headers, causing DLL linkage issues
• I don't quite know how to support the graphics functions that are supposed to be provided by the application yet
• don't know if delayimp.lib should be included when linking

[AlbertStrasheim]

One more minor issue: the filename of the .lib that is generated should be changed, since it currently overwrites the .lib made by the libboincapi static library project.

[AlbertStrasheim]

The following C# application appears to work as expected:

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;

namespace ConsoleApplication1
{
    class Program
    {
        [DllImport("libboincapi.dll")]
        static extern int boinc_init();

        [DllImport("libboincapi.dll")]
        static extern int boinc_finish(int status);

        [DllImport("libboincapi.dll")]
        static extern int boinc_is_standalone();

        static void Main(string[] args)
        {
            int retval = boinc_init();
            retval = boinc_is_standalone();
            boinc_finish(0);
        }
    }
}

[AlbertStrasheim]

It looks like boinc_init_diagnostics should also be part of the API.