JS: Docs and types for additions on top of OFW modules

documentation/js/js_gui__byte_input.md

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+# js_gui__byte_input {#js_gui__byte_input}
+
+# Byte input GUI view
+Displays a keyboard.
+
+<img src="byte_input.png" width="200" alt="Sample screenshot of the view" />
+
+```js
+let eventLoop = require("event_loop");
+let gui = require("gui");
+let byteInputView = require("gui/byte_input");
+```
+
+This module depends on the `gui` module, which in turn depends on the
+`event_loop` module, so they _must_ be imported in this order. It is also
+recommended to conceptualize these modules first before using this one.
+
+# Example
+For an example refer to the `gui.js` example script.
+
+# View props
+## `length`
+Data buffer length
+
+Type: `number`
+
+## `header`
+Single line of text that appears above the keyboard
+
+Type: `string`
+
+## `defaultData`
+Data to show in byte input by default
+
+Type: `Uint8Array | ArrayBuffer`
+
+# View events
+## `input`
+Fires when the user selects the "save" button.
+
+Item type: `ArrayBuffer`