Removed unused old projects

- org.psem2m.isolates.config: Replaced by PyBridge config
- org.psem2m.isolates.foundations: A bunch of Eclipse source link, hard to use
- org.cohorte.composer.agent: Replaced by org.cohorte.composer.isolate
- org.psem2m.composer.api: Old Composer API
- org.cohorte.remote.discovery.signals: Replaced by Herald discovery (other repo)
- signals: Replaced by Herald