优化课表
Merge branch 'macro_dev' of https://github.com/iSCAU/iSCAU-Android into macro_dev

Conflicts:
	app/src/main/java/cn/scau/scautreasure/helper/DatabaseHelper.java
	app/src/main/java/cn/scau/scautreasure/ui/ClassTable.java
Merge branch 'macro_dev' of https://github.com/iSCAU/iSCAU-Android into macro_dev
继续优化全周课表部分