tdf#100236 Implement linestyles with dash and dots.

Allow append dashes to have dash and dot line styles.
Segment length parameters were taken from cppcanvas, also restructure
the code to use the same appendDashes function.

Change-Id: I17c0796dbe722c4c6d5e91d0e318570a52a2514c
Reviewed-on: https://gerrit.libreoffice.org/62084
Tested-by: Jenkins
Reviewed-by: Mark Hung <marklh9@gmail.com>