PIM-3320: clean context from ORM filters
PIM-3320: clean context from ORM sorters
PIM-3320: clean context from Mongo sorters
PIM-3320: clean context from Mongo filters
PIM-3320: fix pqb and mongo filters
PIM-3320: clean sorter and filter definitions
Merge pull request #1780 from akeneo/PIM-3320

PIM-3320: clean context from product query builder api