insert_break: Insert a code break of arbitrary level
In XiaoliangJiang/IndependentStudy2017YW: Structure and abstract your code

A helper function to insert a code break for a given level

1	insert_break(level, insert_with_shiny = options()$strcode$insert_with_shiny)

`level`	The level, a numeric value bounded between 1 and 3
`insert_with_shiny`	A boolean value indicating whether to use a shiny gadget to add separator and possibly title. If set to `FALSE`, simply a separator will be inserted and the user has to set the title himself. To permanently set this argument, you can alter the global option strcode$insert_with_shiny, which is the location where `insert_break` looks up the value when used as an RStudio Add-in.