icon updates
mask() and clip() can take text() args

- no longer necessary to use outline=True in inline text() calls
context mgr support for nofill/nostroke

- fill(None) & stroke(None) also work in `with` statements now
improved text-handling in measure()
default to less lossy jpegs in export()

- should expose the setting as an arg/command line switch
geometry fixes

- reflect() has no c implementation
- removed more inv_sqrt silliness
docstrings for plotdevice.util
moved geo(metry) commands to Point methods
saner parsing of `range` in arc() and oval()

- if the range arg is set to a negative number `-n`, have the range be
[-n, 0] rather than [0, -n]
fonts() now returns family names

- rather than Family objects (which can’t be passed to font() anyway)