Dynamic slots (#36)

* Removed slots configuration

* feature: dynamic slots

* fixes + improvements

* edited core functionality

* added commands for slots management

* added commands english locale

Co-authored-by: d3rp-jsx <15928886+derp-jsx@users.noreply.github.com>

esx_multicharacter.sql

@@ -0,0 +1,7 @@
+CREATE TABLE `multicharacter_slots` (
+	`identifier` VARCHAR(60) NOT NULL DEFAULT '' COLLATE 'utf8mb4_unicode_ci',
+	`slots` INT(11) NOT NULL DEFAULT '1'
+)
+COLLATE='utf8mb4_unicode_ci'
+ENGINE=InnoDB
+;