fmbtgti: hardcoded location files for bitmaps

*Bitmap(filename) methods find the bitmap on every screenshot, if
filename.fmbtoir.loc file contains list of bounding boxes. This helps
hardcoding coordinates of difficult-to-detect bitmaps outside test
scripts, and picking them up from the bitmapPath defined for the
platform. fmbt-scripter supports writing hardcoded location files of
selected bitmaps (click the "Select" button twice).