core v0.7.0

Test input for the co-op panels (a new feature for tests, so a minor release). No breaking changes, no wire protocol
change, nothing changes for players (off unless test_input = 1).

• dll/test_input.h: with test_input = 1 (ini) / --test_input 1 the dll polls <dll dir>\dev\<log tag>.input.txt
  on the render thread (it keeps running while the game's scripts are paused in menus) and runs it line by line:
  pad <buttons> [ms] (the test pad, which it turns on), key <vk>, move x y, click x y, wheel +1|-1,
  wait ms, open pause|lobby|settings|joinip, dump (the open panel's rows, hit boxes and selection into the log),
  log text. The parser is header-only (dll/test_input_script.h).
• ui_input::InjectEvent (an event as if from the window, backbuffer coordinates), CoopUi::Describe,
  CoopUi::OpenForTest.
• Tests: test_input (every command, comments, CRLF, bad lines skipped and reported with their line number, button
  names).