Refactor all image components to ImageKnife and image-preview

[xymeng16]

ImageKnife is a more flexible and powerful image rendering components than the builtin Image component. It's internal caching mechanism can enhance the performance of Homogram, especially when facing tons of profile images.

image-preview can monitor the click event of the image components and to open a fullscreen view of it. Using this to provide the best image viewing experience.

[xymeng16]

8adc2a4 has initially replaced Image component with image-preview, but the onClick method is buggy. It responds to clicks but nothing will be shown. Still need to debug.