[Farmware] Support multiple manifest args

[gabrielburnworth]

FarmBot OS version

8.0.0-rc26

Relevant code

farmbot_os/farmbot_core/lib/farmbot_core/farmware_runtime.ex

Line 115 in 3b118da

{cmd, _} = spawn_monitor(MuonTrap, :cmd, [exec, [manifest.args], opts])

Since the Farmware manifest args field is now a string instead of an array, the above line allows single args (such as "run.py") to work. To support multiple args in the string (such as "run.py -n 1"), a different approach must be used.

[ConnorRigby]

{
 "package": "arg test",
 "language": "sh",
 "author": "FarmBot, Inc.",
 "description": "test",
 "farmware_manifest_version": "2.0.0",
 "package_version": "0.0.0",
 "farmbot_os_version_requirement": ">=0.0.0",
 "farmware_tools_version_requirement": ">=0.0.0",
 "url": "",
 "zip": "https://github.com/FarmBot-Labs/farmware_manifests/archive/master.zip",
 "executable": "sh",
 "args": "-c 'echo hello'"
}