groovyserv: Update to 1.2.0 and build from source

[ryandesign (Ryan Carsten Schmidt)]

groovyserv should be updated to a newer version:

% port livecheck groovyserv
groovyserv seems to have been updated (port version: 0.9, new version: 1.2.0)

When updating, github.tarball_from downloads will be removed from the Portfile since that aspect of GitHub is discontinued and new downloads are not hosted there. At present, according to ​the download page, files are hosted at BitBucket, so when updating the port the Portfile may need to switch from the github portgroup to the bitbucket portgroup.

If possible, switch from using a binary to building from source. This will include removing the lines supported_archs x86_64 and platforms {darwin any}.