Please use `linewidth` instead

[ASKurz]

This is largely fixed. However, two main types of cases remain:

• The linewidth parameter isn't fully supported by tidybayes and ggdist, yet. Based on GitHub (see here), it looks like this will be fixed in the next release of ggdist.
• There are a few cases where I used scale_size_manual(), which should be replaced by scale_linewidth_manual(). However, there was a goof and the current version of ggplot2 doesn't have an option for scale_linewidth_manual() (see here). I'm hoping this will be fixed in the next release of ggplot2.

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