Fancy features

peertube-viewer comes with a bunch of fancy but not really necessary features:

• autocompletion the build systems automatically creates autocompletion for a few shells, available in ./completions
• preloading peertube-viewer-rs is capable of preloading some info in advance. For example when typing :n, the search happens before you type ENTER, the same happens for video information when typing a video id. This makes peertube-viewer-rs much snappier.