1may2018

ver 6.3.4 -- 01may18

• Great new trees: New w3tree package [Class] has improved drawing algorithm to render each of 6 wings from back to front. Nicer looking trees, bamboo & grasses are the result. Easy to use for indie developers.
• Also added tree branch flutter using fragment shader.
• More island grasses & nice fat palm.
• Improved code layout, robustness and comprehensibility;