Remove more traces of ios and chirp.

.github/CODEOWNERS

config/root-config.in

documentation/doxygen/Doxyfile

etc/plugins/TFile/P060_TChirpFile.C

etc/system.plugins-ios

test/ios/RootBrowser/AxisFontInspector.h

test/ios/RootBrowser/AxisFontInspector.mm

test/ios/RootBrowser/AxisFontInspector.xib

test/ios/RootBrowser/AxisInspector.h

test/ios/RootBrowser/AxisInspector.mm

test/ios/RootBrowser/AxisInspector.xib

test/ios/RootBrowser/AxisLabelsInspector.h

test/ios/RootBrowser/AxisLabelsInspector.mm

test/ios/RootBrowser/AxisLabelsInspector.xib

test/ios/RootBrowser/AxisTicksInspector.h

test/ios/RootBrowser/AxisTicksInspector.mm

test/ios/RootBrowser/AxisTicksInspector.xib

test/ios/RootBrowser/AxisTitleInspector.h

test/ios/RootBrowser/AxisTitleInspector.mm

test/ios/RootBrowser/AxisTitleInspector.xib