Add glyphs/Sprint example
Add Text.{x,y}_offset properties
Add UpperCase enum name formatter
Trim value strings read from CSV files
Change defs to vals in sampledata

Data structures there are immutable, so this is allowed.
Add saddle-core to sampledata's dependencies
Add Plot.{width,height} aliases for plot_{width,height}
Replace plot_{width,height} with aliases in examples