活动中心、团队图片功能
Signed-off-by: Demonsu <245681117@qq.com>
Merge branch 'master' of https://github.com/Demonsu/NjuVolunteer

Conflicts:
	public/tpls/templates_c/065819e33f80626bdc30cb4be17a49ec08988f18.file.act_apply.html.php
	public/tpls/templates_c/98ac2491da6aa96dd5b95ddfd79f9643e04a48d2.file.act_handle.html.php
	public/tpls/templates_c/99f4b94be72815d91c8e383d421150d80b9d5a7f.file.act_dtl.html.php
	public/tpls/templates_c/a7916e79428643b39e99c1493974ee1c008cebce.file.team_list.html.php
	public/tpls/templates_c/ae501245acb6019fd59ecfaf5dc2aa117dc89e3a.file.zonet.html.php
	public/tpls/templates_c/bade9366763f2c3ef3f5c78c15ec9639ccea326d.file.login.html.php
	public/tpls/templates_c/f953ae4134724fc8e1e51861dc90910c96308d5b.file.act.html.php

Signed-off-by: Demonsu <245681117@qq.com>