This implements a method for converting between various currencies. When a user
searches "<currency A> to <currency B>" (including when prefixed by a specific
amount), they are now presented with a table for quickly converting between the
two. This makes use of the currency ratio returned as the first "card" in
currency related searches, and the table is inserted into this same card.
This was unfortunately a bit more complex than just adding an HTML reset
button, since reset buttons only "reset" input content to its original
value rather than clearing it. This doesn't work for Whoogle's needs,
since inputs on search result pages are auto populated with the search
content as their default value.
A reset button was introduced anyways, but is controlled by a few lines
of javascript to allow completely clearing the search input. The button
will only appear on mobile searches.
At the moment, it isn't particularly pretty, but is functional. It uses
just a plain "x" character and is always visible on mobile search result
pages. This leaves plenty of room for improvement moving forward.
Fixes#291
Vansh Comar