Mark blocks as noescape

As pointed out by @benasher44 in [pull request 590](https://github.com/ccgus/fmdb/pull/590), blocks should be marked as noescape. This allows additional optimizations (in Swift at least) and eliminates the need to mark nonescaping closures with `@escaping`.

src/fmdb/FMDatabase.h

@@ -511,7 +511,7 @@ typedef int(^FMDBExecuteStatementsCallbackBlock)(NSDictionary *resultsDictionary
 
  */
 
-- (BOOL)executeStatements:(NSString *)sql withResultBlock:(FMDBExecuteStatementsCallbackBlock _Nullable)block;
+- (BOOL)executeStatements:(NSString *)sql withResultBlock:(__attribute__((noescape)) FMDBExecuteStatementsCallbackBlock _Nullable)block;
 
 /** Last insert rowid
  
@@ -985,7 +985,7 @@ typedef int(^FMDBExecuteStatementsCallbackBlock)(NSDictionary *resultsDictionary
  
  */
 
-- (NSError * _Nullable)inSavePoint:(void (^)(BOOL *rollback))block;
+- (NSError * _Nullable)inSavePoint:(__attribute__((noescape)) void (^)(BOOL *rollback))block;
 
 ///----------------------------
 /// @name SQLite library status

src/fmdb/FMDatabasePool.h

@@ -196,21 +196,21 @@ NS_ASSUME_NONNULL_BEGIN
  @param block The code to be run on the `FMDatabasePool` pool.
  */
 
-- (void)inDatabase:(void (^)(FMDatabase *db))block;
+- (void)inDatabase:(__attribute__((noescape)) void (^)(FMDatabase *db))block;
 
 /** Synchronously perform database operations in pool using transaction.
 
  @param block The code to be run on the `FMDatabasePool` pool.
  */
 
-- (void)inTransaction:(void (^)(FMDatabase *db, BOOL *rollback))block;
+- (void)inTransaction:(__attribute__((noescape)) void (^)(FMDatabase *db, BOOL *rollback))block;
 
 /** Synchronously perform database operations in pool using deferred transaction.
 
  @param block The code to be run on the `FMDatabasePool` pool.
  */
 
-- (void)inDeferredTransaction:(void (^)(FMDatabase *db, BOOL *rollback))block;
+- (void)inDeferredTransaction:(__attribute__((noescape)) void (^)(FMDatabase *db, BOOL *rollback))block;
 
 /** Synchronously perform database operations in pool using save point.
 
@@ -221,7 +221,7 @@ NS_ASSUME_NONNULL_BEGIN
  @warning You can not nest these, since calling it will pull another database out of the pool and you'll get a deadlock. If you need to nest, use `<[FMDatabase startSavePointWithName:error:]>` instead.
 */
 
-- (NSError * _Nullable)inSavePoint:(void (^)(FMDatabase *db, BOOL *rollback))block;
+- (NSError * _Nullable)inSavePoint:(__attribute__((noescape)) void (^)(FMDatabase *db, BOOL *rollback))block;
 
 @end
 

src/fmdb/FMDatabaseQueue.h

@@ -201,21 +201,21 @@ NS_ASSUME_NONNULL_BEGIN
  @param block The code to be run on the queue of `FMDatabaseQueue`
  */
 
-- (void)inDatabase:(void (^)(FMDatabase *db))block;
+- (void)inDatabase:(__attribute__((noescape)) void (^)(FMDatabase *db))block;
 
 /** Synchronously perform database operations on queue, using transactions.
 
  @param block The code to be run on the queue of `FMDatabaseQueue`
  */
 
-- (void)inTransaction:(void (^)(FMDatabase *db, BOOL *rollback))block;
+- (void)inTransaction:(__attribute__((noescape)) void (^)(FMDatabase *db, BOOL *rollback))block;
 
 /** Synchronously perform database operations on queue, using deferred transactions.
 
  @param block The code to be run on the queue of `FMDatabaseQueue`
  */
 
-- (void)inDeferredTransaction:(void (^)(FMDatabase *db, BOOL *rollback))block;
+- (void)inDeferredTransaction:(__attribute__((noescape)) void (^)(FMDatabase *db, BOOL *rollback))block;
 
 ///-----------------------------------------------
 /// @name Dispatching database operations to queue
@@ -228,7 +228,7 @@ NS_ASSUME_NONNULL_BEGIN
 
 // NOTE: you can not nest these, since calling it will pull another database out of the pool and you'll get a deadlock.
 // If you need to nest, use FMDatabase's startSavePointWithName:error: instead.
-- (NSError * _Nullable)inSavePoint:(void (^)(FMDatabase *db, BOOL *rollback))block;
+- (NSError * _Nullable)inSavePoint:(__attribute__((noescape)) void (^)(FMDatabase *db, BOOL *rollback))block;
 
 @end