Offset get_timebased_time at game boot

[Whatcookie]

Adds an offset to get_timebased_time at the time of booting a game in the emulator. This can fix some issues that appeared at very high uptime, due to games misusing floating point math.

Problematic games used a pattern of:

read_clock();
convert_to_float();
calculate_delta();

instead of:

read_clock();
calculate_delta();
convert_to_float();

which caused problems with floating point rounding at extreme values of PC uptime.

fixes: #10632

Also fixes some issues with elder scrolls and fallout games

[JimScript]

Thank You, Whatcookie, for fixing this odd problem for R&C:ToD. I didn't expect it would also improve the Gamebryo games, but more the merrier.

[JimScript]

Yeah, it's fixed, This is on a system that has been active for over 8 days.

Before:

After:

And now the space levels don't softlock anymore:

[Satumariko]

nice to meet you.
From this version, the operation has been stable for some titles.
However, there is a problem with the title that was working normally until now.
An example is a title that has a very slow movie playback speed.
In particular, the movies of the works by KOEI are annihilated.

[Reltdeats]

Since this update, KILLZONE® [NPEA00418] cutscenes are accelerated. Tested on the latest update 0.0.18-12716 and still its not working properly.