Pauseable reactive

Create a pauseable reactive. Code from jcheng5 https://gist.github.com/jcheng5/cc6647a4971b8125c1bb

pauseableReactive(x, env = parent.frame(), quoted = FALSE,
  priority = 0, domain = shiny::getDefaultReactiveDomain(),
  paused = TRUE)

Arguments

x	For reactive, an expression (quoted or unquoted). For is.reactive, an object to test.
env	The parent environment for the reactive expression. By default, this is the calling environment, the same as when defining an ordinary non-reactive expression.
quoted	Is the expression quoted? By default, this is FALSE. This is useful when you want to use an expression that is stored in a variable; to do so, it must be quoted with quote().
domain	See domains.
paused	Indicates the starting state of the pauseable reactive.