* do not use NULL on item stats as it prevents searching for an amount of 0 (except for stats that certain items just cant have)
* fix stats from spells granting spell power and spell healing separately
* define and use some item subclasses
* fix empty scaling bar
* fix setting max level for scaling tooltips
* fix displayed periodic power gain value for runic power and rage
* attempt to fix spell coefficient calculation (dear god...)
* append % sign to value for two more auras
* display value per combo point
* fix usage of generic search wildcards: ? *
* only transform search form fields expected to be text
* some cleanup (magic numbers to define, fn return types, nullsafe assignemnts)
* changed logic to not display required arena rating in tooltip or infobox if there are sources that don't require it.
* also, should there be a difference in sources, display lowest required rating, not not highest.
* do not display crafted item tooltip inside recipe tooltip if the craft spell doesn't create an item.
(notably: enchantments were displaying enchantment scrolls)
* always display reagent cost if set
* fixed several deprecation notices and warnings from MySQL8, most notably:
- SQL_CALC_FOUND_ROWS: stopped using DBSimple::selectPage and query 'SELECT COUNT(*) ...' separately where needed
- ON DUPLICATE KEY UPDATE ... VALUES(): use row alias for new values instead of VALUES function
- boolean shorthands to long form (&& -> AND, etc)
* avoid using "echo" to write to CLI as php mistakes it for sent headers (see php-src #12303)
* as we are using fwrite now, errors are written to STDERR instead of STDOUT
* fixes an issue where reloading the config would cause "ini_set(): Session ini settings cannot be changed after headers have already been sent" to be spammed
* split completion table into it's subcomponents
* this should save some disk space as some keys and null fields have been optimized out and col sizes have been reduced
* sort ICC raid bosses first to last
* minor rework
* fixed columns of tab item loot
* fixed lookup of classes/races (as they are the only type used as bitmask)
* implemented reverse lookups everywhere (arguably class, race and skill are too spammy)
* reverse lookups no longer contain redundant data
* changed how the groupKey is set, so there are no more cases that can't be looked up
* fixes#273
* title: added tab 'criteria-of'
* spell: resolve MiscValue for SPELL_AURA_MOD_INVISIBILITY
* search: do not double escape page title
* profiler: fixed typo, causing shaman spirit weapons to be applied _everywhere_
