suggestion: allow explicit spare and temp space check about plotng HOT 2 OPEN

not sure about No.1 as I used a library which gives the free disk space, not sure it works on SMB share. I will add support other plot size in the future.

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Hey @maded2 really nice tool.

Regarding @markkundinger requests.

1. On Windows you need to assign a driveletter to the share, then you get free space reported, otherwise it's always 0.

and for 3.a I experimented on a fork and implemented such a check. Rudimentary, hardcoded and messy as I'm not used to GOLang but so far it works very nicely for me - only tested on windows (https://github.com/Plopsi/plotng/blob/feature/tmp-space/internal/server.go#L135-L216) maybe @maded2 wants to implement it cleaner and configureable ;)

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