add support for auto converting ImageChest (and other hosting sites) links

[shilewenuw]

With imgur going down the gutter, people are going to alternatives like ImageChest.

Current Workarounds:
Select Proxy checkbox -> enter /proxy/api/imgchest/chapter/{REPLACE_WITH_HASH}

All supported image hosts can be found at https://status.cubari.moe/

[Kantotero]

#60 (comment) this but with reddit too please

[stirante]

I intend to add support for those alternatives. The issue currently is that I don't have enough time to do that. Maybe sometime around mid to late december I will be able to do so.

Alternatively you can make a PR with the support. Here is the place, you might want to edit:
https://github.com/stirante/facaccimo/blob/master/src/model/Proxy.js#L7
The values are:
name - this part /proxy/api/<name>/...
niceName - just a nice name to identify the proxy
urlRegex - regular expression for matching ID out of URL. For example getting asd from https://imgur.com/a/asd in case of imgur proxy. A great site, where you can test regex is https://regexr.com/
urlConstructor - a function, that accepts name and id from regex and constructs actual proxy string

Just adding these should add support for new proxies.