Scrapydd

- server and client: ssl validation, support both CLIENT/SERVER validation
- agent: isolate spider's workdir im tmp folder

- server: spider concurrency control.

- server: upload project check parts before read items log
- server: error handling of queueed job with no spider or project
- agent: remove eggs after spider run
- delete eggs when deleting project
- workspace init, return if exception catched
- home page show spider last status
- delproject.json
- fix: upload project did not modify project version

- webui: remove trigger
- cluster state sync

- handle sub process error when uploading project
- upload project, test egg before storing
- items page
- read log file path from job_history table

- fix: agent python running path incorrect on win platform
- fix: agent init workspace future sync wait throw exception
- server fork multi-subprocess, shutdown all subprocesses on closing
- server items count from log file.
- web pages modifications.
- fix: webhook payload_url not updated when editing