Windows build instructions do not describe how to install and manage Swig

[nicost]

The description assumes a working and findable Swig installation ("If you build MMCoreJ, MMCoreJ_wrap.dll will be generated. Additionally, Java source files are generated in build\intermediates\Swig\MMCoreJ. "), but does not describe to install Swig and certinaly not to stay at version 3.0. I am also not quite sure how to tell Visual Studio where Swig is located.

[marktsuchida]

On Windows, we are currently hard-wired to use the SWIG binaries in 3rdpartypublic. This is probably not such a bad thing, because the latest SWIG (4.x) does not work for MMCoreJ yet.

SWIG is invoked from MMCore.vcxproj. The location probably uses definitions in the property sheet (buildscripts/VisualStudio).

The Ant script for MMCoreJ might also (redundantly, outside of Visual Studio) invoke SWIG -- I'm not sure of the top of my head -- but even if it does, it does not build the C++ part.

So to get a complete MMCoreJ (C++ DLL + Java JAR), you need to run both.