Rename IAst to IParseTree.
Rename IDeclarableAst to IDeclarableParseTree.
Rename IAmbiguousAst to IAmbiguousParseTree.
Rename AstAmbiguityType to ParseTreeAmbiguityType.
Rename IAstCast to ParseTreeCastHelper.
Rename AstFactory to ParseTreeFactory.
Rename RecoveryModeAstReader to RecoveryModeParseTreeReader.
Rename methods in RecoveryModeParseTreeReader.
Rename AstVisitor to ParseTreeVisitor.
Rename SequenceAst to SequenceParseTree.
Rename OptionAst to OptionParseTree.
Rename RecoveryModeOptionAstReader to RecoveryModeOptionParseTreeReader.
Rename RecoveryModeSequenceAstReader to RecoveryModeSequenceParseTreeReader.
Rename ListAst to ListParseTree.
Rename RecoveryModeBaseListAstReader to RecoveryModeBaseListParseTreeReader.
Rename RecoveryModeListParseTreeReader to RecoveryModeListAstReader.
Rename Ast to ParseTree.
Fix renaming.
Rename directory Ast to ParseTree.
Rename IExtensibleRuleAstFactory to IExtensibleRuleParseTreeFactory.