Fix the setting of the player colour through mon_glyph

The colour for e.g.

  mon_glyph += player : yellow e

was being ignored by a lookup that only checked the table, due to
recent monster colour changes.
Cppclean: remove unused function declarations.

Also moves some function declarations to the headers of where they
are defined, since Cppclean can't properly distinguish the problems.
Cppclean: remove an unused variable.
Cppclean: some misc. cleanup.

Death to recursive includes!
Disable the corny and inconsistent translation.
Don't make player illusions temporarily ghosts (#9153).
Fix compilation?
Remove C++03 compat hacks.
Another try at fixing weird build issues.
Fix local tiles compilation.
Fix hydra animate skeleton (#9154).
Fix Okawaru hydra corpse piety gain.
Add more uses of 'brand'
End the Fen Folio honeymoon

Increase its rarity from 7 to 12, per the comments made at the
time of its creation. (A little too... specifically themed to be
mega-common.)
Increase low-weight monster Gozag goldification

Switch the baseline mass from 200 (rat) to 550 (human); change
baseline gold from 3 to 13; change weight scale factor from 27 to
40. (Sorry!)

All monsters human weight or smaller now give 6-19 gold (was 1-4
for the smallest monsters); monsters larger than humans now give
somewhat less. (E.g., yaks are down from 18-55 to 16-48.)

This is probably a Gozag buff, but is mainly intended to make
Spider a little more fun/rewarding for Gozagites.