Suggestion: Use raw literals for the hex file

[matthijskooijman]

Since C++11 (which the Arduino IDE has enabled for quite some time now), raw string literals are supported. These are easy multi-line string literals, which would make it even easier to paste a hex file into images.cpp. Instead of

{
":107E0000112494B714BE892F8D7011F0892FDED004\n"
":107E100085E08093810082E08093C00088E18093B8\n"
}

you could write

{R"(
:107E0000112494B714BE892F8D7011F0892FDED004
:107E100085E08093810082E08093C00088E18093B8
)"}

Note the absence of the double quotes and \n around each line, which allows directly pasting from a hex file. It seems this is already supported as-is, but it would be nice to use these in the example in images.cpp, so people know right away.