v0.1.9

Merged PRs:

• #561 Remove unused variable
• #560 Fix non-portable zeroing out of doubles
• #559 Fix theoretical memory leaks
• #557 Document inverted mutex lock/unlock.
• #556 Build tests on appveyor, the MSVC build, but don't run them yet.
• #555 Fold hstox tests into the general linux test.
• #554 Add a monolith_test that includes all toxcore sources.
• #553 Factor out strict_abi cmake code into a separate module.
• #552 Fix formatting and spelling in version-sync script.
• #551 Forbid undefined symbols in shared libraries.
• #546 Make variable names in file saving test less cryptic
• #539 Make OSX test failures fail the Travis CI build.
• #537 Fix #535
• #534 Fix markdown formatting
• #530 Implement missing TES constant functions.
• #511 Save bandwidth by avoiding superfluous Nodes Requests to peers already on the Close List
• #506 Add test case for title change
• #498 DHT refactoring
• #487 Split daemon's logging backends in separate modules
• #468 Test for memberlist not changing after changing own name
• #449 Use new encoding of Maybe in msgpack results.

Closed issues:

• #482 CMake can't detect and compile ToxAV on OSX