Modified .\7-Zip\19.00\CPP\7zip\UI\Console\Main.cpp to build as a dll.  Changes are delimited in the file with "// Start" and "// End" comment brackets.

Additonal files added to support building as a dll. This includes .\7-Zip\eai7zip.vcxproj file to build with:

	Microsoft Visual Studio Professional 2017
	Version 15.9.13
	Microsoft .NET Framework
	Version 4.7.03062

Release_x64 and Debug_x64 builds are include in .\7-Zip\bin_x64. 