Move budget outside of the core

The budget planning feature is now a plugin
See: https://github.com/kanboard/plugin-budget

app/Schema/Mysql.php

@@ -322,19 +322,6 @@ function version_53($pdo)
     $pdo->exec("ALTER TABLE subtask_time_tracking ADD COLUMN time_spent FLOAT DEFAULT 0");
 }
 
-function version_52($pdo)
-{
-    $pdo->exec('CREATE TABLE budget_lines (
-        `id` INT NOT NULL AUTO_INCREMENT,
-        `project_id` INT NOT NULL,
-        `amount` FLOAT NOT NULL,
-        `date` VARCHAR(10) NOT NULL,
-        `comment` TEXT,
-        FOREIGN KEY(project_id) REFERENCES projects(id) ON DELETE CASCADE,
-        PRIMARY KEY(id)
-    ) ENGINE=InnoDB CHARSET=utf8');
-}
-
 function version_51($pdo)
 {
     $pdo->exec('CREATE TABLE timetable_day (
@@ -381,19 +368,6 @@ function version_51($pdo)
     ) ENGINE=InnoDB CHARSET=utf8');
 }
 
-function version_50($pdo)
-{
-    $pdo->exec("CREATE TABLE hourly_rates (
-        id INT NOT NULL AUTO_INCREMENT,
-        user_id INT NOT NULL,
-        rate FLOAT DEFAULT 0,
-        date_effective INTEGER NOT NULL,
-        currency CHAR(3) NOT NULL,
-        FOREIGN KEY(user_id) REFERENCES users(id) ON DELETE CASCADE,
-        PRIMARY KEY(id)
-    ) ENGINE=InnoDB CHARSET=utf8");
-}
-
 function version_49($pdo)
 {
     $pdo->exec('ALTER TABLE subtasks ADD COLUMN position INTEGER DEFAULT 1');