SharedLib example for Windows

[ennerf]

This PR adds an example for compiling against the shared library generated on Windows.

Setup substrate snapshot

Install substrate PR 1235 to the local maven repo: gradlew publishToMavenLocal

and modify the pom.xml:

<plugin>
    <groupId>com.gluonhq</groupId>
    <artifactId>gluonfx-maven-plugin</artifactId>
    <version>${gluonfx.maven.plugin.version}</version>
    <configuration>
        <target>${gluonfx.target}</target>
    </configuration>

    <!-- Use the snapshot build of substrate -->
    <dependencies>
        <dependency>
            <groupId>com.gluonhq</groupId>
            <artifactId>substrate</artifactId>
            <version>0.0.61-SNAPSHOT</version>
        </dependency>
    </dependencies>

</plugin>

Build on Windows

mvn gluonfx:sharedlib
run.bat

The output should be:

**********************************************************************
** Visual Studio 2022 Developer Command Prompt v17.6.3
** Copyright (c) 2022 Microsoft Corporation
**********************************************************************
[vcvarsall.bat] Environment initialized for: 'x64'

E:\gluon\gluon-samples\HelloSharedLib>run
Microsoft (R) C/C++ Optimizing Compiler Version 19.36.32534 for x64
Copyright (C) Microsoft Corporation.  All rights reserved.

example.cpp
Microsoft (R) Incremental Linker Version 14.36.32534.0
Copyright (C) Microsoft Corporation.  All rights reserved.

/out:example.exe
target\gluonfx\x86_64-windows\HelloSharedLib.lib
/out:target\gluonfx\x86_64-windows\example.exe
example.obj
Sum: 3
Diff: -1
Text: Hello from Java