Uses reference in for loop inside ccvector_std_string_to_luaval
closed #8843: Fixes DrawNode::drawPoint crash and uses VAO if it's available when draw points.
Small fixes in Sprite3DTest
Fix kerning on signle characters
Fix Label Additional Kerning All Strings
Add greater than operator to Vec2
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Merge pull request #8918 from dumganhar/iss8843-drawpoint

closed #8843: Fixes DrawNode::drawPoint crash and uses VAO if it's available when draw points.
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Merge pull request #8919 from ahlwong/v3

Fix Label Kerning on Single Characters Cocos2d-X3.3Beta0
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Merge pull request #8928 from Svenito/vec_op

Add greater than operator to Vec2
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