Changes

• Add raw string support (Add raw string support #31).
• Add support for single variable in for-range loops (Add support for single variable in for-range-loop #29).
• Add Split function to std/strings.tsh.
• Add find example for Windows and Linux.
• Fix len on empty string (Batch) (len on empty string leads to endless loop (Batch) #32).
• Fix substring newline handling (Bash).
• Fix negation handling (Single exclamation mark leads to parser issue #30).