implemented folding for the SciTECO lexer

* This currently folds only {...} string arguments and embedded braces,
  most prominently `@^Um{...}` macro definitions..
* Any additional folding for loops and IF-statements should rely on book
  keeping by the main parser.
  This would also help catch syntactic errors, like dangling IFs.
  * We do keep track of the loop nesting, but currently only in execution mode.
* It cannot be disabled via the "fold" property.
  Lexers in the container do not have properties.

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