Skada Damage Meter (Revisited)

* Fixed flags issue causing some pets to not be considered, wrongly attributed or added as separate units, hence better tracking of pets ownership.
* Fixed all encountered and reported typos.
* Fixed windows toggle behavior after using "/skada toggle" and while windows are set to show only in combat.
* Removed and cleaned all judged unused or useless code.
* Reduced function calls and optimized several others which should hopefully result in a slightly/noticeably reduced impact on performance.
* Added "ignored_creatures" table (Tables.lua) that allows players to ignore damage done to or taken from selected creatures.
* Enemy Damage Taken: added support for multiple fake units of the same creature, useful if you want to track different creature stages/phases for example.
* Added back "Absorbed Damage" module that can be found under the "Damage Done" category and that displays the list of players and their absorbed damage DONE.