new blue icons for pause and stop, now also pause changes its color

...p/src/main/java/at/ac/fhstp/sonicontrol/MainActivity.java

...rol/app/src/main/res/drawable-hdpi/ic_pause_blue_48dp.png

...pp/src/main/res/drawable-hdpi/ic_play_arrow_blue_48dp.png

...rol/app/src/main/res/drawable-mdpi/ic_pause_blue_48dp.png

...pp/src/main/res/drawable-mdpi/ic_play_arrow_blue_48dp.png

...ol/app/src/main/res/drawable-xhdpi/ic_pause_blue_48dp.png

...p/src/main/res/drawable-xhdpi/ic_play_arrow_blue_48dp.png

...l/app/src/main/res/drawable-xxhdpi/ic_pause_blue_48dp.png

.../src/main/res/drawable-xxhdpi/ic_play_arrow_blue_48dp.png

.../app/src/main/res/drawable-xxxhdpi/ic_pause_blue_48dp.png

...src/main/res/drawable-xxxhdpi/ic_play_arrow_blue_48dp.png