Watch for rename events in the external editor and re-watch file

[CalebJohn]

Fixes the gedit issue from the forums
I'm a bit wary adding in a change like this, but it doesn't seem to introduce any issues on my machine.
This was added based on a chokidar issue at some point I think chokidar will be fixed and this bit of code can be removed.

I tested this with gedit and gvim, it fixes the issue for both.

I think this also fixes #1614 but it might need more testing.

[laurent22]

Thanks for looking into it @CalebJohn. I'll give it a try on Windows and confirm.

[laurent22]

Thanks for the fix @CalebJohn, it works good.

[void-m4110c]

I still have said error with gvim as external editor.

Since upgrading to the new version this is broken.

1.) When I edit files and save, the new text is not reflected in Joplin (but after save + close it appears)
2.) When I go on writing after I saved the first time (without closing), everything since the first write/save action is lost.

I tried this with both Windows / Linux and Versions 1.2.6 and 1.3.9

Additionally, after creating situation 2 (writing on after saving) on Linux, the Joplin App crashes and I have to kill it (in version 1.3.9)