Material UI: upgrade modals

Also clean up the Create Torrent page, delete some redundant CSS, prevent click-and-drag inside a TextField from moving the whole window, and make all label and input fonts  a consistent 14px size.

src/renderer/components/open-torrent-address-modal.js

@@ -1,32 +1,40 @@
 const React = require('react')
+const TextField = require('material-ui/TextField').default
 
+const ModalOKCancel = require('./modal-ok-cancel')
 const {dispatch, dispatcher} = require('../lib/dispatcher')
 
 module.exports = class OpenTorrentAddressModal extends React.Component {
   render () {
-    // TODO: dcposch remove janky inline <script>
     return (
       <div className='open-torrent-address-modal'>
         <p><label>Enter torrent address or magnet link</label></p>
-        <p>
-          <input id='add-torrent-url' type='text' onKeyPress={handleKeyPress} />
-        </p>
-        <p className='float-right'>
-          <button className='button button-flat' onClick={dispatcher('exitModal')}>Cancel</button>
-          <button className='button button-raised' onClick={handleOK}>OK</button>
-        </p>
-        <script>document.querySelector('#add-torrent-url').focus()</script>
+        <div>
+          <TextField
+            className='control'
+            ref={(c) => { this.torrentURL = c }}
+            fullWidth
+            onKeyDown={handleKeyDown.bind(this)} />
+        </div>
+        <ModalOKCancel
+          cancelText='CANCEL'
+          onCancel={dispatcher('exitModal')}
+          okText='OK'
+          onOK={handleOK.bind(this)} />
       </div>
     )
   }
+
+  componentDidMount () {
+    this.torrentURL.input.focus()
+  }
 }
 
-function handleKeyPress (e) {
-  if (e.which === 13) handleOK() /* hit Enter to submit */
+function handleKeyDown (e) {
+  if (e.which === 13) this.handleOK() /* hit Enter to submit */
 }
 
 function handleOK () {
   dispatch('exitModal')
-  // TODO: dcposch use React refs instead
-  dispatch('addTorrent', document.querySelector('#add-torrent-url').value)
+  dispatch('addTorrent', this.torrentURL.input.value)
 }