• feat: add method named exportDataURL
• feat: set curser default when select locked element
• feat:add attribute named invisible to element data
• feat:add doubleClickElement to idraw
• feat: It wraps text when the text string has \r\n or \n
• fix: it can't transform element'size when it was locked

fix: select-element mode at pointEnd

feat: add event screenClickELement
feat: add element to callback arg for event mouseLeaveELement

• feat: trigger event when select element in onlyrender-status
• feat: add event named mouseOverElement and mouseLeaveElement
• feat: add public function getScreenTransform() to class iDraw