Refactor arrange_schedule.py
Refactor arrange_schedule.py

Combine two function find_text_acticity() and find_image_acticity()
as get_candidates()

stvreumi/electronic-blackboard,stvreumi/electronic-blackboard,stvreumi/electronic-blackboard,stvreumi/electronic-blackboard,SWLBot/electronic-blackboard,SWLBot/electronic-blackboard,SWLBot/electronic-blackboard,SWLBot/electronic-blackboard