[ImgBot] Optimize images

*Total -- 622.05kb -> 494.62kb (20.49%)

/src/res/CLEDBlackSrc.png -- 39.84kb -> 22.43kb (43.69%)
/src/res/instruments/bodhran.svg -- 6.98kb -> 4.06kb (41.81%)
/src/res/HLEDBlackSrc.png -- 18.42kb -> 10.93kb (40.65%)
/src/res/CLEDGreySrc.png -- 35.93kb -> 21.37kb (40.53%)
/src/res/instruments/ukulele.svg -- 17.41kb -> 10.38kb (40.41%)
/src/res/instruments/bassukulele.svg -- 16.59kb -> 9.95kb (40.07%)
/src/res/HLEDGreySrc.png -- 17.34kb -> 10.64kb (38.65%)
/src/res/instruments/bassoon.svg -- 11.52kb -> 7.84kb (31.99%)
/src/res/instruments/flute.png -- 0.91kb -> 0.62kb (31.73%)
/android/res/drawable-xxxhdpi/icon.png -- 9.54kb -> 7.40kb (22.48%)
/android/res/drawable-xxhdpi/icon.png -- 7.31kb -> 5.68kb (22.32%)
/src/res/fronticonserver.png -- 32.21kb -> 25.19kb (21.78%)
/android/res/drawable-xhdpi/icon.png -- 5.11kb -> 4.01kb (21.45%)
/src/res/io.jamulus.jamulus.png -- 26.58kb -> 21.01kb (20.98%)
/android/res/drawable-hdpi/icon.png -- 4.03kb -> 3.26kb (19.2%)
/src/res/instruments/oboe.svg -- 23.46kb -> 19.33kb (17.6%)
/src/res/CLEDRedSrc.png -- 43.51kb -> 36.67kb (15.72%)
/src/res/CLEDYellowSrc.png -- 41.24kb -> 34.84kb (15.53%)
/src/res/CLEDBlackBig.png -- 0.65kb -> 0.55kb (15.25%)
/src/res/instruments/conductor.png -- 0.81kb -> 0.69kb (15.18%)
/src/res/CLEDGreenSrc.png -- 44.17kb -> 37.53kb (15.03%)
/android/res/drawable-mdpi/icon.png -- 2.95kb -> 2.51kb (14.99%)
/src/res/instruments/bongo.svg -- 8.69kb -> 7.53kb (13.29%)
/src/res/fronticon.png -- 2.89kb -> 2.55kb (11.93%)
/src/res/io.jamulus.jamulus.svg -- 1.75kb -> 1.55kb (11.02%)
/src/res/HLEDYellowSrc.png -- 20.74kb -> 18.61kb (10.26%)
/android/res/drawable-ldpi/icon.png -- 2.41kb -> 2.17kb (9.89%)
/src/res/instruments/congas.svg -- 8.61kb -> 7.80kb (9.42%)
/src/res/HLEDGreenSrc.png -- 21.36kb -> 19.37kb (9.31%)
/src/res/HLEDRedSrc.png -- 21.10kb -> 19.16kb (9.21%)
/src/res/instruments/harp.svg -- 90.96kb -> 83.46kb (8.25%)
/libs/opus/doc/opus_logo.svg -- 8.46kb -> 7.78kb (8.01%)
/src/res/instruments/clarinet.png -- 0.57kb -> 0.53kb (7.84%)
/src/res/io.jamulus.jamulusserver.svg -- 3.59kb -> 3.37kb (6.1%)
/src/res/mixerboardbackground.png -- 21.88kb -> 21.34kb (2.45%)
/src/res/flags/flagnone.png -- 0.41kb -> 0.41kb (0.72%)
/src/res/instruments/vocaltenor.png -- 2.12kb -> 2.12kb (0.09%)

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