shorten the command names

Input File (`example_chart.clp`):

    (plot/add-axes

    (plot/axes

        position (bottom left)

        label-format-y (scientific)

        label-format-x (datetime "%H:%M:%S")

        label-placement-x (linear-align 1800))

    (plot/draw-lines

    (plot/lines

        data-x (csv "test/testdata/measurement.csv" time)

        data-y (csv "test/testdata/measurement.csv" value1)

        color #06c)

    (figure/draw-legend

    (figure/legend

        position (top right)

        item (label "Random Data" color #06c))

name: plot/add-axes

name: plot/axes

desc: |

  The `plot/add-axes` command draws up to four labelled 'axis' (top/right/bottom/left) and

  The `plot/axes` command draws up to four labelled 'axis' (top/right/bottom/left) and

  changes the document layout so that further painting takes place inside of the

  rectangle described by the axes.

name: plot/draw-areas

name: plot/areas

desc: |

  The `plot/draw-areas` command takes an input data table, transforms it according

  The `plot/areas` command takes an input data table, transforms it according

  to a user-provided scale configuration and then plots the data as one or more

  'area' shapes.

name: plot/draw-axis

name: plot/axis

desc: |

  The `plot/draw-axis` command draws a labelled 'axis'.

  The `plot/axis` command draws a labelled 'axis'.

arguments:

name: plot/draw-bars

name: plot/bars

desc: |

  The `plot/draw-bars` command takes an input data table, transforms it according

  The `plot/bars` command takes an input data table, transforms it according

  to a user-provided scale configuration and then plots the data as one or more

  'bars' (rectangle shapes).