Add note about loading 9mm turrets

Exactly what it says on the label affixed to all turrets.
use player::recalc_hp to calculate maximal HP in newcharacter.cpp

fix scrolling out of range in the character creation stats tab
Add check for empty default ammo type when spawning matching ammo for guns
call remove_ammo before removing the cut up item.

this gives back all the ammo and the gun mods and contents of the item before it is destroyed.

added a player parameter to remove_ammo functions
fix warning ins newcharachter.cpp

Also replace itypes[] with item_controller->find_template
And use itype::nname(1) instead of itype::name
rename json member "heal" to "healthy" for item types
Use max HP to initialize current HP after character generation.
rename json member "enviromental_protection" to "environmental_protection"
bug fixes to remove_ammo:

remove contents of item in all cases, not just when it is a container.
call game::handle_liquid only when called for the actual player, not when called for NPCs
Fixed keg volume calculation on non-charge liquids (such as water).

Previously charge liquids (such as wine) would calculate correctly
(volume_per_item * charges / charges_per_item) but non-charge liquids
would calculate as (volume_per_item * charges * charges).

A keg containing only the contents of a plastic bottle (capacity 2)
completely filled with fruit wine (volume 2, charges_per_item 7) would
correctly have a usage of 4, while one containing only the contents of
a gallon jug (capacity 15) would correctly have a usage of 30.

Without this fix, a keg filled with a plastic bottle of water would
incorrectly have a usage of 8 (2x the correct value) and a keg filled
with a gallon jug of water would incorrectly have a usage of 450 (15x
the correct value).
Merge remote-tracking branches 'dda/pr/7782', 'dda/pr/7787', 'dda/pr/7788', 'dda/pr/7789', 'dda/pr/7790' and 'dda/pr/7792' into dda-master

* dda/pr/7782:
  Add note about loading 9mm turrets

* dda/pr/7787:
  rename json member "enviromental_protection" to "environmental_protection"
  rename json member "heal" to "healthy" for item types

* dda/pr/7788:
  Use max HP to initialize current HP after character generation.
  fix warning ins newcharachter.cpp
  use player::recalc_hp to calculate maximal HP in newcharacter.cpp

* dda/pr/7789:
  Add check for empty default ammo type when spawning matching ammo for guns

* dda/pr/7790:
  bug fixes to remove_ammo:
  call remove_ammo before removing the cut up item.

* dda/pr/7792:
  Fixed keg volume calculation on non-charge liquids (such as water).