remove suspicious method from reactive engine
change line endings of Time.scala to project default (\n)
define apply() as alias for get in signal, Dependents use set
define update as alias for set in Var interface
actually make apply() ↔ get and update ↔ set aliases final
rename suspicious type parameter shadowing
refactor signal apply implementation
move map implementation to signal interface

this does change semantics compared to the previous implementation
of the Var maps. the previous var implemenatition did NOT create
a dependent signal but a new var instead, which seems nonsensical.
local renaming, scaladoc, code style
turns out, StaticVar was just a Copy&Paste from VarSynt
fix test filename
SignalSynt local renamings, doc
delete duplicate test
change HigherOrderTestSuite line endings to project default (\n)
minor code style changes in HigherOrderTestSuite
experimental: readd signal to queue if its level increased during evaluation
mark StaticSignal as deprecated and remove uses from codebase
convert more comments to scaladoc
use Dependent to add and remove listeners to keep set in sync
refactor DynamicDependentSignal implementation into own superclass