v0.2.3

Merged PRs:

• #951 Only run astyle if the astyle binary exists.
• #950 Remove utils.c and utils.h from toxencryptsave build.
• #949 Fixes to the imported sodium sources to compile without warnings.
• #948 Add a MAX_HOSTNAME_LENGTH constant.
• #947 Remove the format test.
• #937 Add new Circle CI configuration.
• #935 Add a test for double conference invite.
• #933 Add Logger to various net_crypto functions, and add const to Logger where possible.
• #931 Avoid conditional-uninitialised warning for tcp test.
• #930 Disable UDP when proxy is enabled.
• #928 Use clang-format for C++ code.
• #927 Add assertions to bootstrap tests for correct connection type.
• #926 Make NULL options behave the same as default options.
• #925 Add tests for what happens when passing an invalid proxy host.
• #924 Make the net_crypto connection state an enum.
• #922 Clarify/Improve test_some test
• #921 Beginnings of a TCP_test.c overhaul
• #920 Add test for creating multiple conferences in one tox.
• #918 Merge irungentoo/master into toktok
• #917 Add random testing program.
• #916 Fix linking with address sanitizer.
• #915 Remove resource_leak_test.
• #914 Make dht_test more stable.
• #913 Minor cleanup: return early on error condition.
• #906 Sort bazel build file according to buildifier standard.
• #905 In DEBUG mode, make toxcore crash on signed integer overflow.
• #902 Log only the filename, not the full path in LOGGER.
• #899 Fix macOS macro because of GNU Mach
• #898 Fix enumeration of Crypto_Connection instances
• #897 Fix ipport_isset: port 0 is not a valid port.
• #894 Fix logging related crash in bootstrap node
• #893 Fix bootstrap crashes, still
• #892 Add empty logger to DHT bootstrap daemons.
• #887 Fix FreeBSD build on Travis
• #884 Fix the often call of event tox_friend_connection_status
• #883 Make toxcore compile on BSD
• #878 fix DHT_bootstrap key loading
• #877 Add minitox to under "Other resources" section in the README
• #875 Make bootstrap daemon use toxcore's version
• #867 Improve network error reporting on Windows
• #841 Only check full rtp offset if RTP_LARGE_FRAME is set
• #823 Finish @Diadlo's network Family abstraction.
• #822 Move system header includes from network.h to network.c