Leftwm changed from toml to ron format

[arcolinuxz]

Could you make a new file for leftwm?

Toml configuration was like this.

border_width = 1
margin = [1, 1]

default_border_color = "#4c566a"
floating_border_color = "#4c566a"
focused_border_color = "#5e81ac"

And ron configuration is like this.

(
border_width: 1,
margin: [1, 1],
default_border_color: "#4c566a",
floating_border_color: "#4c566a",
focused_border_color: "#5e81ac",
)

I better put @vuimuch in copy if that is possible here.

[eylles]

pywal is as good as unmaintained, if you can "cook" up a new template i will gladly add it to pywal16 before releasing 3.4.0 which i DO intend to put out the release tag before the end of the month, i just gotta document changes across 150 commits right now.

cc @VuiMuich