Small script api additions (linked PR #1)

[TheLostInPlace]

LINKED PR # 1

This PR was split into a 4 part PR due to the size and to aid in reviewing changes

The MT version will contain all 4 plus an MT specific change

Changes

A handful of small script exports and fixes, one commit each.

• setting a light's range from script now really changes it, the light used to ignore a change
  smaller than ten percent
• the mouse wheel callback now reaches the actor
• the real depth from the projection, a call that projects a whole list of points at once, and a
  way to ask whether the ui has grabbed the input
• ini files: remove a whole section, read a key with four floats
• weapons: stop the zoom, ask whether the scope draws through a texture, and the hud and weapon
  state enums
• the inventory slot enum
• how much each kind of zone is affecting the actor right now
• condition and visual name of a server side item
• luabind: calling a function with too few arguments now gives a lua error instead of reading past
  the start of the overload table

Nothing changes for scripts that do not use these. Every new export and enum is listed in
lua_help_ex.script. Built DX11-AVX x64. Merges into the MT branch without conflicts.