Upgrade RapidJSON

[kkaefer]

RapidJSON 1.1.0 was released and has some goodies:

• C++11 range loop syntax
• Comments(!) and trailing commas, as well as NaN/Infinity
• Reduced memory usage

[mention-bot]

@kkaefer, thanks for your PR! By analyzing this pull request, we identified @jfirebaugh, @mikemorris and @ansis to be potential reviewers.

[kkaefer]

/cc @brunoabinader @jfirebaugh

[jfirebaugh]

For future reference, can you include a rundown of what the clang-tidy issue was and how we worked around it here or in the commit message?

[kkaefer]

clang-tidy issue is that the code path for allocating memory in RapidJSON is pretty complicated and I think clang-tidy trips over this. I followed the code path with Xcode's visual analyze feature and think that it is correct. Therefore, I added a .clang-tidy file that disables these checks with in the folder where RapidJSON's write features are used (offline.cpp)

[kkaefer]

Can't test linking of libgeojson on Android due to #6193. I'll refrain from merging for now.

[kkaefer]

@brunoabinader @jfirebaugh please review