Implement safe shell reloading inside omf plugin
This commit adds an improved reload code for Oh My Fish, besides saving the history now the reloading technique keeps directory history and stack and clears fish_greeting, for a transparent transition. The reloading code is now safe regarding to background jobs. exec wipes fish job control, so the user-facing code under the (just- introduced by this commit) `omf reload` command is kept safe by a warning. For testing purposes, `omf update` and `omf remove` rolls automatic refresh only when `OMF_AUTO_RELOAD` variable is set. Recap of the commit: - Add improved reload code (omf.reload) - Add a safe reload code (omf.cli.reload) - Add `omf reload` command - Add opt-in reload to `omf update` and `omf remove` commands
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