removed the qt gui from sflphone

src/gui/official/images/clear_off.png

src/gui/official/images/clear_on.png

src/gui/official/images/close_off.png

src/gui/official/images/close_on.png

src/gui/official/images/conference_off.png

src/gui/official/images/conference_on.png

src/gui/official/images/directory_off.png

src/gui/official/images/directory_on.png

src/gui/official/images/dtmf_0_off.png

src/gui/official/images/dtmf_0_on.png

src/gui/official/images/dtmf_1_off.png

src/gui/official/images/dtmf_1_on.png

src/gui/official/images/dtmf_2_off.png

src/gui/official/images/dtmf_2_on.png

src/gui/official/images/dtmf_3_off.png

src/gui/official/images/dtmf_3_on.png

src/gui/official/images/dtmf_4_off.png

src/gui/official/images/dtmf_4_on.png

src/gui/official/images/dtmf_5_off.png

src/gui/official/images/dtmf_5_on.png