v0.12.0 - Derp Regions are dead, long live the derpers

⛰️ Features

• (bytes) Switch to a single directory for the flat store (#1855) - (adc88f3)
• (net) Add Magicsock::network_change (#1845) - (3952b04)
• Usage metrics reporting (#1862) - (7ec4d92)
• Remove derp regions in favor of direct urls (#1831) - (4002c46)
• Additional public get utils - (1389857)

🐛 Bug Fixes

• (ci) Enable forks to run netsim manually (#1834) - (54acfcb)
• (iroh) Check output for blob get (#1898) - (52f17a3)
• (iroh) Do not exit after commands (#1899) - (53ab3b0)
• (iroh-net) Fix display of mixed type connections (#1882) - (9d047e0)
• (iroh-net) Do not prune addrs that are just added (#1916) - (4b18e67)
• (sync) Handle migration 004 in the empty case (#1852) - (860563f)
• Use path_to_key helper function in iroh doc import (#1811) - (64b668e)
• Do not block on network change (#1885) - (54d5efc)
• Fix abort on ctrl-c in console (#1909) - (712b45e)

🚜 Refactor

• (iroh) Remove the addr arg from start (#1830) - (e03de38)
• (iroh) Remove request token (#1828) - (1dfb7ac)
• (iroh) Remove rpc port option (#1842) - (d1fcfca)
• (iroh-bytes) Remove explicitly passing the runtime to the flat store (#1829) - (3d2e118)
• (iroh-net) Make ControlMsg public (#1895) - (c6bc3c2)
• (logging) Reduce loglevel of blob GC (#1866) - (3b1652c)
• (tests) Slow down a hot loop (#1910) - (9ac88ef)
• Upgrade to hyper 1.0 (#1858) - (b8aa5d6)
• Streamline local endpoint discovery (#1847) - (cb20bb8)
• Client Entry with methods to read content (#1854) - (690e2aa)

🧪 Testing

• (iroh-net) Try fix flaky udp_blocked test - (0418af6)
• (net) Use actual derp hostname and reduce iteration count (#1886) - (62ac4d8)

⚙️ Miscellaneous Tasks

• (ci) Run cargo build for android platforms (#1843) - (227f0e8)
• (ci) Configure sccache to use local caches (#1865) - (4b07c2d)
• (ci) Split jobs so they do not stomp over target directory (#1871) - (b9709ef)
• (ci) Pin clippy to specific nightly version (#1874) - (6433a66)
• (ci) Windows sccache (#1873) - (0d9ebea)
• (ci) Split release builds from regular CI flows (#1883) - (ce97cee)
• (ci) Test derper deploy flow (#1884) - (a1c5b56)
• (ci) Use TRACE logging for tests run by nextest (#1902) - (b789a1f)
• (clippy) Fix some warnings (#1861) - (57bb691)
• (docs) Update derp IP for EU region (#1880) - (5c43b1d)
• (iroh,iroh-bytes) Fix manifest keywords (#1881) - (b4da5f4)
• Add BSD3 license note for code derived from tailscale (#1889) - (876a0f5)

Ref

• (iroh-net) Improve how STUN probes are run (#1642) - (b95eb86)