liborigin 2.0.0

### - i -

- iendianfstream() : std::iendianfstream
- index() : tree< T, tree_node_allocator >
- insert() : tree< T, tree_node_allocator >
- insert_after() : tree< T, tree_node_allocator >
- insert_subtree() : tree< T, tree_node_allocator >
- insert_subtree_after() : tree< T, tree_node_allocator >
- is3D() : Origin::GraphLayer
- is_in_subtree() : tree< T, tree_node_allocator >
- is_valid() : tree< T, tree_node_allocator >
- isValid() : Origin::Rect
- iterator_base() : tree< T, tree_node_allocator >::iterator_base