Clean up dashboard padding and coloring

[snide]

Cleans up the new dashboards with margins. Makes the following changes.

• Tries to keep stylistic decisions in edit mode similar between the two types + two themes.
• Fixes the resize handle in dark mode by adding a new encoded svg.
• Tries somewhat to telegraph that only titles are draggable.
• Fixes overall padding and spacing of dashboard items.
• Switched edit icon to gear. The K6 font-awesome arrows don't read because they are too small.

Things that aren't super fixable without aggressive CSS.

• Context menu arrow positioning. Better to have the gear aligned properly than the menu. The menu should later be fixed when the rest of the K7 options port over (specifically more than just bottom positioning).

@stacey-gammon I only tested this with some dummy dashboards I had. If you can run it through some of yours I'd appreciate it. I don't necessarily know where some of this stuff gets pulled in.

[stacey-gammon]

Looks great! To get tests passing you need to update the jest snapshots (run with - u. Are you synced with master? I notice some warnings on the console for jest tests that I thought should have been fixed.

[snide]

@stacey-gammon Tests passing. This just merges to master right, does it need backporting?

[stacey-gammon]

Failed on:

21:15:19          │ debg  findByCssSelector [href="#/visualize"]
21:15:19          │ debg  clickVisualizationByLinkText(Visualization TileMap)
21:15:29          │ debg  --- tryForTime failure: [POST http://localhost:9515/session/21ea5810e48093bcf0685b3775896faf/element / {"using":"partial link text","value":"Visualization TileMap"}] no such element: Unable to locate element: {"method":"partial link text","selector":"Visualization TileMap"}
21:15:29          │         (Session info: chrome=62.0.3202.75)
21:15:29          │         (Driver info: chromedriver=2.33.506092 (733a02544d189eeb751fe0d7ddca79a0ee28cce4),platform=Linux 4.4.0-45-generic x86_64)
21:15:40          │ debg  --- tryForTime failed again with the same message  ...
21:15:51          │ debg  --- tryForTime failed again with the same message  ...
21:16:01          │ debg  --- tryForTime failed again with the same message  ...
21:16:02          │ debg  Taking screenshot "/var/lib/jenkins/workspace/elastic+kibana+pull-request+multijob-selenium/test/functional/screenshots/failure/visualize app tile map visualize app tile map chart should save with zoom level and load, take screenshot.png"
21:16:02        └- ✖ fail: "visualize app tile map visualize app tile map chart should save with zoom level and load, take screenshot"
21:16:02        │        tryForTime timeout: [POST http://localhost:9515/session/21ea5810e48093bcf0685b3775896faf/element / {"using":"partial link text","value":"Visualization TileMap"}] no such element: Unable to locate element: {"method":"partial link text","selector":"Visualization TileMap"}
21:16:02        │         (Session info: chrome=62.0.3202.75)
21:16:02        │         (Driver info: chromedriver=2.33.506092 (733a02544d189eeb751fe0d7ddca79a0ee28cce4),platform=Linux 4.4.0-45-generic x86_64)
21:16:02        │           at Server._post (/var/lib/jenkins/workspace/elastic+kibana+pull-request+multijob-selenium/test/functional/services/remote/verbose_remote_logging.js:15:21)
21:16:02        │           at runRequest (/var/lib/jenkins/workspace/elastic+kibana+pull-request+multijob-selenium/node_modules/leadfoot/Session.js:92:40)

with screenshot:

lets see if this is flaky,

jenkins, test this

[stacey-gammon]

it will need to be backported to 6.x @snide. lets wait to merge till the ci passes.

[stacey-gammon]

LGTM