Optimize FindIndizes

[MichaelHuth]

When profiling MIEs it turns out that FindIndizes runtime is a considerable part.

Ideas for optimization:

• for text comparison use "binary comparison" that should be faster
• while doing that add property to switch between case-sensitive/case-insensitive. Use binary comparison as case-sensitive.
• try to speed up Multithread step, move more work into MatrixOp
• Check if special case for often used setups can be faster. (e.g. 1d input wave)