Update sticker scripts to new hexSticker version

[jorainer]

The last changes to hexSticker (see issue GuangchuangYu/hexSticker#6) break (almost?) all R scripts to create the stickers.

Update the scripts to create the stickers using the new hexSticker package.

[GuangchuangYu]

sorry, should be the last time.

[GuangchuangYu]

maybe wait a second. Let me see if I can add a parameter to switch from different units

[jorainer]

No prob @GuangchuangYu - that's what can be expected when using a devel version.

[GuangchuangYu]

@jotsetung I use npc, see https://github.com/GuangchuangYu/ggimage/blob/master/R/geom_subview.R#L41-L44. The width and height are expected to be in proportion to the plot.

It seems the npc is actually native (maybe a bug), so width and height work as in native unit.

## make no sense XD
> require(grid)
Loading required package: grid
> plot(1:10)
> pushViewport(viewport())
> convertX(unit(.9,"npc"),"native")
[1] 0.9native

please go ahead to update your script 🙈, I have no idea why this happened.

[jorainer]

@GuangchuangYu , you are not changing hexStickers now, are you?

[GuangchuangYu]

@jotsetung no.

[jorainer]

OK, fixed all of my stickers.
@lgatto, should I keep the issue open until you fixed yours?

[GuangchuangYu]

with new version, it is easier to generate treeio sticker.

[GuangchuangYu]

updated s_width = original s_width * sqrt(3)
updated s_height = original s_height * 2

[lgatto]

@lgatto, should I keep the issue open until you fixed yours?

Leave it for now, I'll close once I get time to update mine.