Widget's name are the current way to retrieve them when using GML.
Presently, there is no way to differentiate two items that share the
same name.
`IncrementalSearchBanner` uses common names as "close_button" or
"next_button", prepend them with `incremental_search_banner_` avoid
collisions.
This fixes a bug where the close button of `CrashReporter` was confused
with the one of the search banner.
However, This solution isn't perfect, down the road, we should probably
find a way to warn about equal names and introduce something like
namespace to avoid huge prefixes.
Compared to traditional modal search, incremental search begins
matching as soon as the user starts typing, highlighting results
immediately. This refactors Itamar's work for HackStudio into a
common LibGUI widget to be used in all multi-line TextEditors.
