[ImgBot] Optimize images - #1

*Total -- 210.43kb -> 39.72kb (81.12%)

/src/main/resources/images/menu/composite.gif -- 0.84kb -> 0.08kb (90.48%)
/src/main/resources/images/menu/compositeToNavi.gif -- 0.85kb -> 0.08kb (90.09%)
/src/main/resources/images/menu/unused/add.gif -- 0.85kb -> 0.09kb (89.43%)
/src/main/resources/images/menu/assoNavToNav.gif -- 0.84kb -> 0.09kb (88.99%)
/src/main/resources/images/menu/aggregation.gif -- 0.85kb -> 0.10kb (88.26%)
/src/main/resources/images/menu/aggregationToNavi.gif -- 0.85kb -> 0.10kb (87.76%)
/src/main/resources/images/menu/unused/delSelect.gif -- 0.87kb -> 0.12kb (86.7%)
/src/main/resources/images/OGV.png -- 192.66kb -> 33.49kb (82.62%)
/src/main/resources/images/menu/structureclass.gif -- 0.94kb -> 0.25kb (73.49%)
/src/main/resources/images/menu/mm_pc_fd.gif -- 0.94kb -> 0.25kb (73.16%)
/src/main/resources/images/menu/testcase.gif -- 0.96kb -> 0.26kb (72.35%)
/src/main/resources/images/menu/ActivityClassDiagram.gif -- 0.97kb -> 0.27kb (71.72%)
/src/main/resources/images/menu/unused/close_button.gif -- 0.52kb -> 0.17kb (67.42%)
/src/main/resources/images/menu/message_error.png -- 1.45kb -> 0.56kb (61.64%)
/src/main/resources/images/menu/unused/close_button_rollover.gif -- 0.53kb -> 0.23kb (56.19%)
/src/main/resources/images/menu/message_warn.png -- 1.45kb -> 0.69kb (52.56%)
/src/main/resources/images/menu/error.png -- 1.14kb -> 0.55kb (51.63%)
/src/main/resources/images/menu/message_info.png -- 1.45kb -> 1.03kb (29.14%)
/src/main/resources/images/menu/general.gif -- 0.13kb -> 0.10kb (18.32%)
/src/main/resources/images/menu/rightAngleOff.gif -- 0.13kb -> 0.11kb (17.78%)
/src/main/resources/images/menu/info.png -- 1.14kb -> 1.02kb (10.21%)
/src/main/resources/images/menu/multiplicity.gif -- 0.07kb -> 0.07kb (8.11%)

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