Make coronata work on Linux with ARM processor (e.g., Raspberry Pi)

[awvalenti]

Currently, the native libraries used by coronata are compiled to x86 architecture, so they probably won't work on ARM processors.

[awvalenti]

1. Obtain BlueCove-GPL for ARM, either by:
   • getting it from https://oss.sonatype.org/content/repositories/snapshots/br/com/criativasoft/opendevice/ext/bluecove-gpl-arm/2.1.1-SNAPSHOT/ (maybe https://oss.sonatype.org/#nexus-search;quick~bluecove-gpl-arm works)
   • on Raspberry Pi, building source code from https://code.google.com/archive/p/bluecove/source/default/source gpl-arm/2.1.1-SNAPSHOT/
2. Modify BlueCove so that it chooses the right native library based on platform (Linux x86 or Linux ARM)
3. Add result as a Maven project on GitHub
4. Reference it from coronata-linux-general