Make string pool strings static in memory

- Use multiple chunks that get allocated as old ones get filled up
  instead of reallocating, store direct pointers to the strings in
  the id array.
- This prevents nasty surprises when previously retrieved pointer
  to a pool string goes invalid underneath us due to somebody
  adding a new string, and restores former rpm API behavior:
  string pointers retrieved from eg rpmds and rpmfi are valid for
  the entire lifetime of those objects.

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