Move budget outside of the core

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

app/Schema/Sqlite.php

@@ -292,18 +292,6 @@ function version_52($pdo)
     $pdo->exec("ALTER TABLE subtask_time_tracking ADD COLUMN time_spent REAL DEFAULT 0");
 }
 
-function version_51($pdo)
-{
-    $pdo->exec('CREATE TABLE budget_lines (
-        "id" INTEGER PRIMARY KEY,
-        "project_id" INTEGER NOT NULL,
-        "amount" REAL NOT NULL,
-        "date" TEXT NOT NULL,
-        "comment" TEXT,
-        FOREIGN KEY(project_id) REFERENCES projects(id) ON DELETE CASCADE
-    )');
-}
-
 function version_50($pdo)
 {
     $pdo->exec('CREATE TABLE timetable_day (
@@ -346,18 +334,6 @@ function version_50($pdo)
     )');
 }
 
-function version_49($pdo)
-{
-    $pdo->exec("CREATE TABLE hourly_rates (
-        id INTEGER PRIMARY KEY,
-        user_id INTEGER NOT NULL,
-        rate REAL DEFAULT 0,
-        date_effective INTEGER NOT NULL,
-        currency TEXT NOT NULL,
-        FOREIGN KEY(user_id) REFERENCES users(id) ON DELETE CASCADE
-    )");
-}
-
 function version_48($pdo)
 {
     $pdo->exec('ALTER TABLE subtasks ADD COLUMN position INTEGER DEFAULT 1');