TUN-3201: Create base cloudflared UI structure

vendor/github.com/gdamore/tcell/terminfo/README.md

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+This package represents the parent for all terminals.
+
+In older versions of tcell we had (a couple of) different
+external file formats for the terminal database.  Those are
+now removed.  All terminal definitions are supplied by
+one of two methods:
+
+1. Compiled Go code
+
+2. For systems with terminfo and infocmp, dynamically
+   generated at runtime.
+
+The Go code can be generated using the mkinfo utility in
+this directory.  The database entry should be generated
+into a package in a directory named as the first character
+of the package name.  (This permits us to group them all
+without having a huge directory of little packages.)
+
+It may be desirable to add new packages to the extended
+package, or -- rarely -- the base package.
+
+Applications which want to have the large set of terminal
+descriptions built into the binary can simply import the
+extended package.  Otherwise a smaller reasonable default
+set (the base package) will be included instead.