Hot reload UI polish (#5193)

* General improvoments to the loader app:
   * Show a message after 8 seconds if no connection comes in.
   * Show a progress bar as files are being uploaded.
   * Hide the spinner just before launching the application.

* General improvements to the "flutter run" UI:
   * Add "?" key as a silent alias for "h".
   * Make the help text bold so it doesn't get mixed with the logs.
   * Make "R" do a cold restart when hot reload is enabled.

* Supporting features and bug fixes:
   * Add support for string service extensions.

* Other bug fixes:
   * Expose debugDumpRenderTree() outside debug mode.
   * Logger.supportsColor was missing a getter.
   * Mention in the usage docs that --hot requires --resident.
   * Trivial style fixes.
9 files changed
tree: 018c89838e0a6d41cd295aad43396b1730cf0a12
  1. bin/
  2. dev/
  3. examples/
  4. packages/
  5. .analysis_options
  6. .travis.yml
  7. AUTHORS
  8. CONTRIBUTING.md
  9. ISSUE_TEMPLATE.md
  10. LICENSE
  11. README.md
  12. VERSION
README.md

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