* update spell attribute descriptions primary from TC, secondary from Wowdev Wiki (not guaranteed to be correct for 335)
* show all attributes on SpellDetailPage
* update links from attributes to SpellFilter
* unsure: should the attribute filters work purely on attributes or also consider other factors?
* implement some of the client side modifiers on the spell tooltips and buffs
* followup on 748a78c3c7
* fix return type of criteria filter callbacks (mostly in case of faulty input)
* spread the criteria var into criteria filter callbacks
* some magic numbers to constants and type declarations for params/return types
* add 'fished' as valid item source
* item source 'none' now properly selects items without source, not items without source from this list
* fixed edgecases where filter callback might have no return value
* provide empty values for non-default db fields when initializing external accounts
* removed browser check for username maxlength as it depends on auth method
* update events and actions to match TrinityCore again
* removed events and actions have been kept but marked as deprecated
* general rewording and use of UIES for better readability
* move constants to respective classes
* reevaluate usage of UNIT_FIELD_BYTES1 content
* detatch from User and Util and move to its own enum class
* added definitions for all locales the 12340 client could in theory have
* this is incompatble with the Intl extension
* version bump and php requirement bump
* 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
