Bind variables in queries

• Adds QueryOption type, queries can take options now
• Add WithBind (takes a single variable and value) and WithBinding (takes a map of substitutions) to bind variables in a query
• Add Prolog.QueryOnce for grabbing single answers without needing to iterate

Catch-up

• Update Trealla to latest
• Disambiguate atoms and strings.
• Return stderr as well as stdout
• More detailed Variable term
• BigInt support
• Make everything thread-safe

Query iterators

• Queries are now returned as iterators.
• Update embedded Trealla to guregu/trealla 0.5.1.

Add library path option

• Add WithLibraryPath option, equivalent to the --library flag in Trealla.

Persistence and speedup

• Interpreter is now persistent (same strategy as guregu/trealla-js#1)
• Uses latest WASM build, which has a lot of speedups

v0.1.5

• Update Trealla to v2.0.8

Full Changelog: v0.1.4...v0.1.5

v0.1.4

• Update Trealla to v2.0.7

v0.1.3

• Update Trealla to v2.0.6
• Optimize Trealla binary with wasm-opt (much smaller now)

v0.1.2

• Update Trealla to v2.0.3

v0.1.0

• Refactor a bit: no more Result status, return ErrFailure or ErrThrow instead.
• Catch syntax errors (and return ErrThrow).

Full Changelog: v0.0.9...v0.1.0