Dynamic draw value

Try to avoid repetition draws at early midgame,
this should give an edge against weaker opponents
and reduce draw rate.

Tested for regressions with SPRT[-3, 1] and
passed both short TC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 68498 W: 12928 L: 12891 D: 42679

And long TC
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 40212 W: 6386 L: 6295 D: 27531

bench: 7990513
Retire UCI_AnalyseMode option

It has been obsoleted out already some time ago
and currently there is no point in changing eval
score according to if we are in game or analyzing.

So retire the option.

No functional change.
Simplify Bitboards::pretty

No functional change.
Rename xxx_to_char() -> to_char()

No functional change.
Remove limit of minimumSplitDepth

There is no reason why an user cannot set
it at a value less than 4.

No functional change.
Pass CastlingFlag argument only

Instead of Color and CastlingSide. Change functions API
accordingly.

No functional change.
Revert dynamic draw value

When tested with weaker engines did not
performed as expected, actually it was even
a regression from standard version.

bench: 8430785
Some minor cleanup stuff

I came across while browsing the code.

No functional change.
Fix dbg_mean_of() for negative numbers

Type should be int64_t instead of uint64_t

No functional change.
Sync with master

bench: 8430785