Preferences: choose dark or light icons depending to OS theme...

dark foreground text color > dark icons, light text > light icons

73 files changed, 814 insertions, 12309 deletions

diff --git a/res/images/ic_custom.svg b/res/images/ic_custom.svg
deleted file mode 100644
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diff --git a/res/images/ic_mixxx_symbolic.svg b/res/images/ic_mixxx_symbolic.svg
deleted file mode 100644
index c51004a455..0000000000
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