Log Message:
awesome: Update to 4.3

Note: no documentation included yet, we don't have the tools

Awesome v4.3 is the third release of the 4.x API. It comes after one and
a half years of little fixes and improvements. Awesome v4.2 was very
stable thanks to everybody's effort to unit test everything. Given no
major bug warranted a new release, this one adds a few large features
while preserving full compatibility with existing user configurations.

Some highlights:
- Better DPI handling
- Extendable awful.rules providers and better awful.spawn functions
- A brand new keygrabber API
- A new GTK color palette based theme
- Widgets improvements