Finished first revision of a useful branch sequence builder
(PrevaylerServiceBranchSequenceCreator).

Implemented a couple of short-hand methods for branch creation (a Util
in PrevaylerServiceBranchContinuation and a Util in
PrevaylerServiceBranchCreator).

Implemented first succesfull usage of branch sequence builder in plot
tool for plotting empty models.

Signed-off-by: Jakob Brandsborg Ehmsen <jakobehmsen.github@gmail.com>