feat: Add option for graph drawing direction

[lenianiva]

Description

This adds 3 boolean flags to the graph widget. flip-x, flip-y, vertical. By default, both x and y axes are flipped (the old behaviour), and the x, y axes follow the same directions as the screen. The flip-x and flip-y flags toggle the direction of x and y axes and vertical swaps the two axes, so you could have a graph that goes (time-axis) from left to right, bottom to top, etc.

Usage

(defwindow vbar
	:exclusive true
	:monitor 0
	:windowtype "dock"
	:geometry (geometry
		:x "0%"
		:y "0%"
		:width "25px"
		:height "99%"
		:anchor "center left"
	)
	:reserve (struts :side "left" :distance "20px")
	(widget-memory))

(defwidget widget-memory []
				(graph
					:width 20
					:height 100
					:vertical true
					:flip-y false
					:value {EWW_RAM.used_mem_perc}
					:time-range "30s"
					:dynamic false
					:max 100
					:min 0))

shows the memory graph on the left side of the screen going from bottom to top.

Showcase

This is taken from my own configurations

Additional Notes

There are other ways to arrange the flags, but in total there are 8 possible combinations

Checklist

Please make sure you can check all the boxes that apply to this PR.

• All widgets I've added are correctly documented.
• I added my changes to CHANGELOG.md, if appropriate.
• The documentation in the docs/content/main directory has been adjusted to reflect my changes.
• I used cargo fmt to automatically format all code before committing