fmbtgti: refactoring ocr started

fmbtgti will support pluggable OCR engines
more of that refactoring
first working refactored ocr engine
OCR refactoring: OCR find arguments isolated to engine
fmbtgti.GUIItem stringify more flexible
fmbtgti: fixed recognizing tapPos by ...OcrText()
Merge remote-tracking branch '01/devel'