Magic Resistance, Encumbrance, Turning and much more

* Fixed tableGroupFind() when final group table does not contain search item.
* Converted var declarations to use let and const where possible.
* Tried to enhance speed of library algorithms.
* Added sizable dialog text and custom API buttons.
* Added dialog highlight tag to highlight important information.
* Added _abc_(...) syntax for inserting hyperlink buttons into dialogs.
* Added use of n:=n, spec for to-hit data to force single attack per round for weapons (e.g. when using an oil flask).
* Added the u: and tu: class/race data tags for "undead" & "turn undead".
* Created the hidden class "Priest-no-turning" as a parent for priest subclasses that do not have the power to turn undead.
* Made start-up DB indexing asynchronous to stop Roll20 detecting an "infinate loop" error on slower devices.
* Added Magic Resistance Table.
* Added encumbrane data.
* Updated call syntax for attrLookup() and resolveData() to use objects for optional parameters.

Author: DameryDad