Fixed #68: Implement SheerkaQL

Fixed #70: SheerkaFilterManager : Pipe functions
Fixed #71: SheerkaFilterManager : filter_objects
Fixed #75: SheerkaMemory: Enhance memory() to use the filtering capabilities
Fixed #76: SheerkaEvaluateConcept: Concepts that modify the state of the system must not be evaluated during question

src/cache/FastCache.py

@@ -12,6 +12,9 @@ class FastCache:
         self.lru = []
         self.default = default
 
+    def __contains__(self, item):
+        return self.has(item)
+
     def put(self, key, value):
         if len(self.cache) == self.max_size:
             del self.cache[self.lru.pop(0)]