* [Quest API] Add Entity Variable Methods to Perl/Lua.
# Perl
- Add `$mob->ClearEntityVariables()`.
- Add `$mob->DeleteEntityVariable(variable_name)`.
- Add `$object->ClearEntityVariables()`.
- Add `$object->DeleteEntityVariable(variable_name)`.
# Lua
- Add `mob:ClearEntityVariables()`.
- Add `mob:DeleteEntityVariable(variable_name)`.
- Add `object:ClearEntityVariables()`.
- Add `object:DeleteEntityVariable(variable_name)`.
# Notes
- Allows operators to clear all entity variables or delete one by name, previously you just had to set to an empty value to clear after being set.
* Cleanup.
* [Quest API] Add Entity Variable Methods to Perl/Lua.
# Perl
- Add `$mob->GetEntityVariables()`.
- Add `$object->GetEntityVariables()`.
# Lua
- Add `mob:GetEntityVariables()`.
- Add `object:GetEntityVariables()`.
# Notes
- Convert all overloads and methods to use `std::string` for entity variables.
- Allows operators to get a list of a Mob's entity variables.
* Update loottables.cpp
