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+- arcs aren't quite right yet
+- comment text orientation ?
+- better text size guessing
+- hierarchical labels
+- sub-sheets
+- unify alignment, direction
+- support fonts attributes ?
+- support line thickness ?
+- show unit in component reference
+- ~ as space
+- ~ as overline
+- support pin name not inside component
+- check if pin name/number placement changes if one is disabled
+- glabel: build for "right" style, then rotate poly
+- break into file reading, internal storage, rendering
+- show open pins / wires
+- check remaining alignment / direction / rotation cases in switch statements
+- convert abort / assert(0) to proper error indications
+- support mirroring