Moved functions to entity members where appropriate

Some functions were skipped for now because they may need a new name
or change of behavior. Changes:

    chr_warp                        entity:warp
    chr_get_inventory               entity:inventory
    chr_inv_change                  entity:inv_change
    chr_inv_count                   entity:inv_count
    chr_get_equipment               entity:equipment
    chr_equip_slot                  entity:equip_slot
    chr_equip_item                  entity:equip_item
    chr_unequip_slot                entity:unequip_slot
    chr_unequip_item                entity:unequip_item
    chr_get_level                   entity:level
    chr_get_exp                     entity:xp
    chr_give_exp                    entity:give_xp
    chr_get_rights                  entity:rights
    chr_set_hair_style              entity:set_hair_style
    chr_get_hair_style              entity:hair_style
    chr_set_hair_color              entity:set_hair_color
    chr_get_hair_color              entity:hair_color
    chr_get_kill_count              entity:kill_count
    chr_give_special                entity:give_special
    chr_has_special                 entity:has_special
    chr_take_special                entity:take_special
    chr_set_special_recharge_speed  entity:set_special_recharge_speed
    chr_get_special_recharge_speed  entity:special_recharge_speed
    chr_set_special_mana            entity:set_special_mana
    chr_get_special_mana            entity:special_mana
    chr_kick                        entity:kick
    exp_for_level                   xp_for_level
    monster_get_id                  entity:monster_id
    monster_change_anger            entity:change_anger
    monster_drop_anger              entity:drop_anger
    monster_get_angerlist           entity:angerlist
    being_apply_status              entity:apply_status
    being_remove_status             entity:remove_status
    being_has_status                entity:has_status
    being_set_status_time           entity:set_status_time
    being_get_status_time           entity:status_time
    being_get_gender                entity:gender
    being_set_gender                entity:set_gender
    being_type                      entity:type
    being_walk                      entity:walk
    being_say                       entity:say
    being_damage                    entity:damage
    being_heal                      entity:heal
    being_get_name                  entity:name
    being_get_action                entity:action
    being_set_action                entity:set_action
    being_get_direction             entity:direction
    being_set_direction             entity:set_direction
    being_apply_attribute_modifier  entity:apply_attribute_modifier
    being_remove_attribute_modifier entity:remove_attribute_modifier
    being_set_base_attribute        entity:set_base_attribute
    being_get_modified_attribute    entity:modified_attribute
    being_get_base_attribute        entity:base_attribute
    being_set_walkmask              entity:set_walkmask
    being_get_walkmask              entity:walkmask
    being_get_mapid                 entity:mapid
    chat_message                    entity:message
    being_register                  entity:register
    chr_shake_screen                entity:shake_screen
    chr_create_text_particle        entity:show_text_particle
    -                               entity:position
    posX                            entity:x
    posY                            entity:y
    monster_get_name                monsterclass:name
    item_get_name                   itemclass:name
Dropped the & from the Lua function tables

It's not actually necessary.