Initialize logging explicitly and read the clock through std::chrono

[gunnarbeutner]

Initialize logging explicitly instead of on the first message. Debug_Init takes argc and argv from WinMain, which already built them. That also drops a second command line parse. Messages before the call still reach the
debugger and console.

Read the millisecond clock through std::chrono. The timer then needs no initialization at all: steady_clock replaces the cycle counter and the multimedia timer fallback, so the class holds no state and logs nothing before
main. Call sites which require the current time now read System_Milliseconds(), which counts from the first reading rather than machine boot; every one of them compares readings, so the origin is not needed anyway. timeGetTime, GetTickCount, timeBeginPeriod and timeEndPeriod have no callers left.

This also fixes an inverted condition: timeEndPeriod was called exactly when timeBeginPeriod had not been, and skipped when it had.

[github-actions]

Development builds of 5274ed9:

• opents-x64-Debug-b11233a
• opents-x64-Release-b11233a
• opents-Win32-Release-b11233a
• opents-Win32-Debug-b11233a

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