player: slightly refactor/simplify cache pausing logic

The underlying logic is still the same (basically pausing if the demuxer
cache underruns), but clean up the higher level logic a bit. It goes
from 3 levels of nested if statements to 1.

Also remove the code duplication for the --cache-pause-initial logic.

In addition, make sure an earlier buffering state has no influence on
the new state after a seek (this is also why some of the state resetting
can be removed from loadfile.c).

Initialize cache_buffer always to 100. It basically means we start out
assuming all buffers are filled enough. This actually matters for
verbose messages only, but removes some weird special casing.

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