Swap from pkg to npm sea for jbrowse-cli (#348)

* Swap from pkg to npm sea for jbrowse-cli

* Update tar version to latest

* Add fallback for tar package

* Build from any host to any target and fix JBrowseManager test

* Update package.json

* Update package-lock.json

* Drop dependency on pkg

* Add unzipper as a fallback for cli unzip

---------

Co-authored-by: Sebastian Benjamin <sebastiancbenjamin@gmail.com>
Co-authored-by: bbimber <bbimber@gmail.com>

Author: 3 people

jbrowse/build.gradle

@@ -30,7 +30,7 @@ dependencies {
 	external "org.apache.lucene:lucene-backward-codecs:${luceneVersion}"
 }
 
-def jbPkgTask = project.tasks.named("npm_run_jb-pkg")
+def jbPkgTask = project.tasks.named("npm_run_jb-sea")
 
 jbPkgTask.configure {
     outputs.cacheIf {false}