CSS: remove unneeded prefixes, add standard properties, remove px from 0s

[valtlai]

• Add standard transform, filter, animation and width: max-content
• Remove prefixed border-radius, box-shadow, transition,
  linear-gradient(), box-sizing, text-overflow, flex-direction
  and display: flex
• Remove prefixed transform from standard @keyframes
• Remove px from zero values

(Replaces #12163)

[marcelgerber]

Am I right in the assumption that you have had your GitHub name changed? In that case, you need to sign the CLA again (http://dev.brackets.io/brackets-contributor-license-agreement.html).

[valtlai]

@marcelgerber, done.

[valtlai]

What is the Chromium version on Linux now? Maybe prefixed transform, animation and @keyframes can be removed too.

[marcelgerber]

Unfortunately, it's still ~ Chromium 29 on Linux builds.

For some reason, the CLA check still fails, even after re-running the Travis build multiple times. re you sure you have provided the correct username in the form?

[valtlai]

@marcelgerber I think I did.

However, check details contains "x-ratelimit-limit":"60","x-ratelimit-remaining":"0","x-ratelimit-reset":"1470359670"

Edit: and "message":"API rate limit exceeded for 52.22.60.255. too.

[ficristo]

Still LGTM, but I prefer if someone else could do the last check.

[marcelgerber]

I would like to have this briefly tested on Linux as well, at least looking out for obvious regressions.
If no one else offers to take over this task, I can probably revive my Linux Mint VM :)

[ficristo]

I gave a try on a VM with Ubuntu 16.04 and didn't notice anything obviously wrong.

[marcelgerber]

Going for it in that case. Thank you all!
Merging.