Request to track Priest's Chest Rune: Serendipity

It would probably re-use the Serendipity effect from Wrath of the Lich King, although we need confirmation that the spell ID remains the same.

Closing issue, because the ability has been tested successfully for months, although not all glowing buttons were tested for so long. Since then, these "new" spells have been usable. There were no report indicating they don't work, which is not surprising because the code is very solid.

Implemented in 1.1.0-beta with the following assumptions (confirmation needed by priests, please!)

• Spell Alert displayed identically to Wrath flavor, except the spell ID is 413247 (TBC)
• Glowing Button options for the following spells, when the player under the effect of Serendipity:
  • Lesser Heal
  • Heal
  • Greater Heal*
  • Prayer of Healing*

* currently unattainable in Season of Discovery, due to level requirements