Add character-specific zone-based experience modifiers. (#1326)

* Add character-specific zone-based experience modifiers.

This will allow server operators to give players individual experience modifiers (regular and AA).

Zone ID 0 will server as a global modifier for players, if no rows are found the modifier defaults to 1.0 so experience is neither increased nor decreased.

Setting a zone-specific modifier will override the zone ID 0 global modifier.

Requires a SQL update: sql/git/required/2021_04_11_character_exp_modifiers.sql

- Add quest::getaaexpmodifierbycharid(character_id, zone_id) to Perl.
- Add eq.get_aa_exp_modifier_by_char_id(character_id, zone_id) to Lua.
- Add quest::getexpmodifierbycharid(character_id, zone_id) to Perl.
- Add eq.get_exp_modifier_by_char_id(character_id, zone_id) to Lua.
- Add quest::setaaexpmodifierbycharid(character_id, zone_id, aa_modifier) to Perl.
- Add eq.set_aa_exp_modifier_by_char_id(character_id, zone_id, aa_modifier) to Lua.
- Add quest::setexpmodifierbycharid(character_id, zone_id, exp_modifier) to Perl.
- Add eq.set_exp_modifier_by_char_id(character_id, zone_id, exp_modifier) to Lua.
- Add $client->GetAAEXPModifier(character_id, zone_id) to Perl.
- Add client:GetAAEXPModifier(character_id, zone_id) to Lua.
- Add $client->GetEXPModifier(character_id, zone_id) to Perl.
- Add client:GetEXPModifier(character_id, zone_id) to Lua.
- Add $client->SetAAEXPModifier(zone_id, aa_modifier) to Perl.
- Add client:SetAAEXPModifier(zone_id, aa_modifier) to Lua.
- Add $client->SetEXPModifier(zone_id, exp_modifier) to Perl.
- Add client:SetEXPModifier(zone_id, exp_modifier) to Lua.

* Removed unneeded [].

* Fix variable name,

* Fix variable name.

* Fix version.h.

* Rename 2021_04_11_character_exp_modifiers.sql to 2021_04_23_character_exp_modifiers.sql

* Update db_update_manifest.txt

utils/sql/git/required/2021_04_23_character_exp_modifiers.sql

@@ -0,0 +1,7 @@
+CREATE TABLE `character_exp_modifiers`  (
+  `character_id` int NOT NULL,
+  `zone_id` int NOT NULL,
+  `aa_modifier` float NOT NULL,
+  `exp_modifier` float NOT NULL,
+  PRIMARY KEY (`character_id`, `zone_id`) USING BTREE
+) ENGINE = InnoDB CHARACTER SET = latin1 COLLATE = latin1_swedish_ci ROW_FORMAT = Compact;