Add GitHub Action to produce all artifacts

[chris-allan]

Updates the build process to handle all steps using GitHub Actions:

• Build of Win64 native artifact
• Build of Linux64 native artifact
• Build of macOS native artifact
• Combination build of Java outputs and native artifacts from all 3 platforms

Of note:

• Builds of the Win64 native artifact are now being performed by VS2019. This should mean a new dependency on the VC 2019 C++ redistributable on Windows. (Needs validation)
• Builds of the Linux64 native artifact are being performed using the manylinux2010 infrastructure from PyPA. This should preserve CentOS 6 compatibility.
• Builds of the macOS native artifact are now being performed using XCode 11.3.2. macOS version compatibility will need to be validated.

/cc @sbesson, @jburel

[chris-allan]

@stick: We will need to validate where we have still have access to CentOS 6.

[melissalinkert]

Minimal test: https://gist.github.com/melissalinkert/500944d2215902b11502b8b726a41c18

Run javac -cp jxrlib-all-0.2.4.jar:. JXRTest.java, then java JXRTest img6_lowest_res.jxr with an appropriate runtime classpath. The test file is in s3://bf-data-repo/jpegxr-test/. Runtime classpath will require:

• jxrlib-all-0.2.4.jar
• logback-classic.jar
• logback-core.jar
• native-lib-loader.jar
• slf4j-api.jar
• working directory

All jars except jxrlib-all-0.2.4.jar are zipped in s3://bf-data-repo/jpegxr-test/jars.zip

[stick]

tested on centos6:

12:30:58.759 [main] DEBUG o.s.nativelib.NativeLibraryUtil - processor is INTEL_64 os.arch is amd64
12:30:58.760 [main] DEBUG o.s.nativelib.NativeLibraryUtil - architecture is LINUX_64 os.name is linux
12:30:58.769 [main] DEBUG o.s.nativelib.NativeLibraryUtil - architecture is LINUX_64 os.name is linux
12:30:58.769 [main] DEBUG o.s.nativelib.NativeLibraryUtil - platform specific path is META-INF/lib/linux_64/
12:30:58.769 [main] DEBUG o.scijava.nativelib.BaseJniExtractor - mappedLib is libjxrjava.so
12:30:58.769 [main] DEBUG o.scijava.nativelib.BaseJniExtractor - URL is jar:file:/home/cm298/jxr-test/jxrlib-all-0.2.4.jar!/META-INF/lib/linux_64/libjxrjava.so
12:30:58.769 [main] DEBUG o.scijava.nativelib.BaseJniExtractor - URL path is file:/home/cm298/jxr-test/jxrlib-all-0.2.4.jar!/META-INF/lib/linux_64/libjxrjava.so
12:30:58.777 [main] DEBUG o.scijava.nativelib.BaseJniExtractor - Extracting 'jar:file:/home/cm298/jxr-test/jxrlib-all-0.2.4.jar!/META-INF/lib/linux_64/libjxrjava.so' to '/tmp/libjxrjava12900523056665113279.so'
bytes per pixel = 3
BGR = false

[melissalinkert]

Closing as discussed in the context of upcoming work on #32.