[ImgBot] Optimize images

*Total -- 509.88kb -> 403.30kb (20.9%)

/AltCover.Visualizer/Screenshot-GTK.png -- 70.22kb -> 48.00kb (31.64%)
/AltCover.Visualizer/Screenshot-GTK3.png -- 87.07kb -> 60.39kb (30.63%)
/AltCover.UICommon/Property.png -- 0.63kb -> 0.47kb (24.96%)
/AltCover.UICommon/Effect.png -- 0.64kb -> 0.49kb (23.63%)
/AltCover.UICommon/Font.png -- 0.61kb -> 0.48kb (22.58%)
/AltCover.UICommon/StatusError.png -- 0.66kb -> 0.52kb (21.6%)
/AltCover.Visualizer/Screenshot-Avalonia.png -- 89.91kb -> 71.04kb (20.98%)
/AltCover.UICommon/Class.png -- 0.55kb -> 0.44kb (19.33%)
/AltCover.UICommon/logo.png -- 2.39kb -> 2.00kb (16.25%)
/AltCover.UICommon/Namespace.png -- 0.48kb -> 0.40kb (16.02%)
/AltCover.UICommon/StatusError_32.png -- 1.26kb -> 1.07kb (15.22%)
/AltCover.UICommon/Assembly.png -- 0.40kb -> 0.34kb (15.16%)
/RegressionTesting/issue143/SaveContextToDatabaseStep-Coverage.png -- 121.20kb -> 102.98kb (15.04%)
/AltCover.UICommon/ExpandDown.png -- 0.38kb -> 0.32kb (14.87%)
/RegressionTesting/issue143/SupplementContextWithDatabaseRecordStep-Coverage.png -- 121.73kb -> 103.63kb (14.87%)
/AltCover.UICommon/Report.png -- 0.42kb -> 0.36kb (14.72%)
/AltCover.UICommon/TextFile.png -- 0.39kb -> 0.33kb (14.32%)
/Build/AltCover_128.png -- 2.04kb -> 1.78kb (12.64%)
/AltCover.UICommon/StatusError_32.svg -- 0.80kb -> 0.70kb (11.75%)
/AltCover.UICommon/StatusInformation_32.svg -- 0.75kb -> 0.66kb (11.73%)
/AltCover.UICommon/StatusInformation.svg -- 0.53kb -> 0.47kb (11.7%)
/AltCover.UICommon/StatusWarning.svg -- 0.54kb -> 0.48kb (11.59%)
/AltCover.UICommon/StatusWarning_32.svg -- 0.72kb -> 0.64kb (11.23%)
/AltCover.UICommon/StatusError.svg -- 0.59kb -> 0.53kb (10.63%)
/AltCover.UICommon/ExpandRight.png -- 0.34kb -> 0.31kb (10.03%)
/AltCover.UICommon/MissingFile.png -- 0.41kb -> 0.38kb (7.43%)
/AltCover.UICommon/VisualStudioToolsAboutBox.png -- 0.49kb -> 0.46kb (6.01%)
/AltCover.UICommon/Web.png -- 0.69kb -> 0.65kb (5.65%)
/AltCover.UICommon/Module.png -- 0.38kb -> 0.36kb (5.6%)
/AltCover.UICommon/StatusInformation.png -- 0.51kb -> 0.50kb (3.24%)
/AltCover.UICommon/OpenFile.png -- 0.51kb -> 0.50kb (2.68%)
/AltCover.UICommon/MethodMissing.png -- 0.70kb -> 0.69kb (2.09%)
/AltCover.UICommon/Exit.png -- 0.67kb -> 0.66kb (1.32%)
/AltCover.UICommon/Blank.png -- 0.28kb -> 0.28kb (1.03%)

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