Add method of disabling includes

Base feature

Range

• All includes between <include-ignore-start> and <include-ignore-end> are not processed for <includes>
  • This should be able to be paired with comments in the source language, for example:

    // <include-ignore-start>`
    <include path="not-included.txt">
    /* <include-ignore-end> */

Single

• Add option disable[d] as inline option
  • <include ... disabled>
  • <include ... disable=true>