Features that should be implemented before the release of v2

[domitry]

glyph

• [x] ~~box~~
• [x] vectors (line_segments)
• [ ] ~~heatmap~~
• [x] rect
• [x] text
• [x] arrow (anotation)

sheet

• [x] legend
• [x] tooltip

extensions

• [ ] mapnya
• [ ] nyaplot3d
• [ ] bionya