Highlight auto like variables
Highlight auto like variables

Clang introduced a new type, CXType_Auto for variables that are defined
using auto. These were not highlighted by color_coded because it was
missing in the switch statement.

jeaye/color_coded,tony/color_coded,jeaye/color_coded,jeaye/color_coded,UnrealQuester/color_coded,tony/color_coded,UnrealQuester/color_coded,tony/color_coded,jeaye/color_coded,UnrealQuester/color_coded,tony/color_coded,UnrealQuester/color_coded