Merge pull request #5676 from odoo-dev/8.0-memory_optimization-rco

Reduce memory footprint of server

The tricks used are:
- use a global LRU for `ormcache` (auto-balancing between registries);
- remove unnecessary data structures (binary class hierarchy of models);
- compute some data structures on demand (`_all_columns`);
- optimize field attributes (empty collections may be shared);
- optimize memory size of fields and columns by using slots.

On a database with modules sale, purchase and stock installed, the memory footprint of the registry went from 20.3Mb to 7.4Mb (as measured with heapy). In other words, the memory footprint was reduced to 1/3 !

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