Pycares

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- core: give better errors descriptions for AresError
- test: add IDNA test using the query() API
- cffi: simplify destroying ares channel

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- core: reorganize package
- core: automagically encode query names with IDNA

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- errno: fix errorcode dictionary

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- core: add support for ANY queries
- cffi: fix memory leak

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- core: drop C backend
- core: drop Python < 3.5 support
- core: use None instead of -1 for default values
- core: set TTL to -1 when we cannot parse it

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- misc: fix building wheels for unavailable Python versions
- test: skip getaddrinfo6 test on Travis
- doc: add FreeBSD building instructions
- build: fix MinGW build
- ci, misc: add support for CPython 3.7
- ci: run on latest PyPy versions on TravisCI
- examples: extra examples
- ci: fix AppVeyor build
- test: fix TXT test
- core: fix repr for PTR results