Reduce image size

[aa13058219642]

建议把提取出来的图缩一下再扔到网站上，加快一点网站速度

[PaleNeutron]

Please make a research about appropriate resize ratio on different page.

For example, on unit list page, picture source size is 512x256 but real size on 1080p screen is 340x170

I will add a new ratio parameter on statics collecting function interface

def get_img(self, img_dirs, force43=False, fill_color="#fff", force=False, ratio=1.0):

and then add ratios here.