Flow unit frame auras: debuffs first on enemies, own size, spacing

Unit frame aura icons are placed by a layout pass after each aura
refresh instead of a fixed grid set at setup. Rows are as tall as
their largest icon, and the debuff block no longer uses the debuff
size to step past buff rows. (Closes #25)

- When buffs and debuffs share a corner, debuffs come first on
  neutral and hostile units.
- New Own Buff Size / Own Debuff Size (-1 = normal size) enlarge the
  player's auras, which C_UnitAuras already lists first.
- New Buff/Debuff X-Spacing and Y-Spacing set the gaps between icons
  and rows; the default of 1 keeps the old look.
- The selfdebuff tooltip remap is gone from unit frames and buffwatch:
  own auras lead the list, so the HARMFUL|PLAYER index is the HARMFUL
  index.

env/translations_enUS.lua

@@ -87,6 +87,8 @@ pfUI_translation["enUS"] = {
   ["Buffs"] = nil,
   ["Buff Size"] = nil,
   ["Buff Spacing"] = nil,
+  ["Buff X-Spacing"] = nil,
+  ["Buff Y-Spacing"] = nil,
   ["Buffs Per Row"] = nil,
   ["Button"] = nil,
   ["Button already exists in pfMinimapButtons frame"] = nil,
@@ -192,6 +194,8 @@ pfUI_translation["enUS"] = {
   ["Debuff Position"] = nil,
   ["Debuffs"] = nil,
   ["Debuff Size"] = nil,
+  ["Debuff X-Spacing"] = nil,
+  ["Debuff Y-Spacing"] = nil,
   ["Debuffs Per Row"] = nil,
   ["Decode"] = nil,
   ["Default"] = nil,
@@ -582,6 +586,8 @@ pfUI_translation["enUS"] = {
   ["Overwrite If Unit Is Attacking Others"] = nil,
   ["Overwrite If Unit Is Attacking You"] = nil,
   ["Overwrite If Unit Is Casting"] = nil,
+  ["Own Buff Size"] = nil,
+  ["Own Debuff Size"] = nil,
   ["Owner Name"] = nil,
   ["Pageable"] = nil,
   ["Paging Actionbar"] = nil,