fmbtwindows: added onScreen parameter to findItemsBy* methods
fmbtwindows: added onScreen parameter to findItemsBy* methods

tapText and verifyText return True only if text is on screen.

mixu-/fMBT,violep01/fMBT,mixu-/fMBT,mixu-/fMBT,01org/fMBT,mixu-/fMBT,yoonkiss/fMBT,yoonkiss/fMBT,01org/fMBT,mixu-/fMBT,yoonkiss/fMBT,01org/fMBT,violep01/fMBT,yoonkiss/fMBT,violep01/fMBT,violep01/fMBT,violep01/fMBT,yoonkiss/fMBT,01org/fMBT,01org/fMBT