[LBBS-97] system.c: Evaluate shell syntax/variables when launching programs

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Some loose ends to tidy up, from commit https://github.com/InterLinked1/lbbs/commit/a433d7eea4667733dfce09f4c938d23026cde6d5

* Environment variables like $HOME and shell shorthand like ~ are
  not evaluated prior to the program being launched, so full paths
  always need to be provided (BBS variables are okay). This isn't
  really specific to this change, but is important since it is
  intuitive to use such syntax in mailbox rules; currently, this doesn't work.

We should figure out a way to make it work.

• For example, in a MailScript EXEC rule, using $HOME and ~ don't work (evaluate to nothing).
• chdir to home directory also doesn't work

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