Sane defaults for Greasepencil assets

Given we are not allowed to save changes to default brush assets, it is imperative that the default brush settings are at least usable. Two things stand out in particular:

1. The "simplify" setting under post-processing is far too aggressive. It results in strokes with extremely lopsided vertex distribution, a problem that becomes especially apparent when...

2. The default "strength" value for every sculpt brush is also very high. It takes extraordinary delicacy to sculpt lines as intended with these settings, especially in combination with the aforementioned vertex shenanigans.

Few things are quite so disruptive as laying all of my lines only to discover later that sculpting them is impossible unless I subdivide the stroke back up to (or more likely beyond) a reasonable number of vertices.