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1. Add error banner
2. Show the failing target
3. Show which targets to add rather than which .jar files to add
4. Show all errors rather than the first from each class.

Example error:
============================= Dependency Checks Failed =============================
Target: //base:base_java
Direct classpath is incomplete. To fix, add deps on:
 * com_android_support_support_compat_java
     * android.support.v4.view.ViewCompat (needed by org.chromium.base.ApiCompatibilityUtils and 1 more)

Bug: None
Change-Id: I26c6ea94d4df4167737519ad181131f8efecc00b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2208813
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Sam Maier <smaier@chromium.org>
Cr-Commit-Position: refs/heads/master@{#771049}