Fixed #3: Added sheerka.resolve_rule()

Fixed #5: Refactored SheerkaComparisonManager
Fixed #6: Sya parser no longer works after restart

src/parsers/BnfNodeParser.py

@@ -1291,7 +1291,7 @@ class BnfNodeParser(BaseNodeParser):
                         debugger.debug_log(debug_prefix + ", all parsers are locked. Nothing to do.")
                     continue
 
-                concepts = self.get_concepts(token, self._is_eligible, strip_quotes=False)
+                concepts = context.sheerka.get_concepts_by_first_token(token, self._is_eligible, strip_quotes=False)
 
                 if not concepts:
                     if debugger.is_enabled():
@@ -1475,7 +1475,7 @@ class BnfNodeParser(BaseNodeParser):
         desc = f"Resolve concept parsing expression for '{concept}'. {key_to_use=}"
         with context.push(BuiltinConcepts.INIT_BNF, concept, who=self.name, obj=concept, desc=desc) as sub_context:
             if not concept.get_bnf():  # 'if' is done outside to save a function call. Not sure it worth it.
-                BaseNodeParser.ensure_bnf(sub_context, concept, self.name)
+                core.builtin_helpers.ensure_bnf(sub_context, concept, self.name)
 
             grammar[key_to_use] = UnderConstruction(concept.id)