Hash Table interfaces

[vyzo]

This brings hash table interfaces to the runtime, with native (specializable) implementations using open addressing and quadratic probing. The impetus for implementing gerbil-native hash tables is SMP read-safety and the ability to internally wrap mutexes/(fail-fast-)read-write-locks if the user so desires. The problem stems from the lazy rehashing in gambit native hash tables, which means a read can actually write, which can lead to disaster at so many fronts as concurrent reads can crash in SMP. Bonus points increased performance, from better locality.

Work Items:

• [x] raw table implementation with common specializations
• [x] use symbolic tables in keyword-dispatch
• [x] use symbolic tables in the mop
• [x] bring interfaces into the core
• [x] HashTable interface and implementation of hash-* primitives with it
• [x] fix tests

Follow Up:

• [ ] implement interface method specializations now that they are in the core

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[vyzo]

there is still quite a bit of work here, I want to pull interfaces in core to implement the hash- zoo with a HashTable interface.