Add missing keywords.txt files to bundled libraries

[per1234]

Partially resolves #5179

CC: @Makuna

[earlephilhower]

LGTM, but I don't think the IDE looks past the first tab, so the add'l specifiers may not be used (LITERAL, etc.). Still seems to run fine on the one I checked, DNSServer.

Thanks for helping out!

[per1234]

With the switch to using the RSyntaxTextArea editor in Arduino IDE 1.6.5 and newer, the fourth field of keywords.txt (RSYNTAXTEXTAREA_TOKENTYPE) overrides the second field (KEYWORD_TOKENTYPE). If that field is not present, the IDE falls back to using KEYWORD_TOKENTYPE, but with a less fine-grained range of keyword coloration than in Arduino IDE 1.6.4 and older.

You can see the use of the RSYNTAXTEXTAREA_TOKENTYPE field demonstrated in the Arduino core library's keywords.txt:
https://github.com/arduino/Arduino/blob/master/build/shared/lib/keywords.txt

The new keywords.txt format has not been very widely adopted because the Arduino developers never bothered to document it and the previous format continues to work.

I usually don't bother to use the new format, but decided I'd make the extra effort in this case. If you prefer the old keywords.txt format, I'll be happy to update the PR.

Details:
https://github.com/arduino/Arduino/wiki/Arduino-IDE-1.5:-Library-specification#keywordstxt-format

[earlephilhower]

No, it's fine the way it is. I'd just never seen it before. Thx!