Signed-off-by: Gnanakeethan Balasubramaniam <gnanakeethan@gmail.com>

Signed-off-by: Gnanakeethan Balasubramaniam <gnanakeethan@gmail.com>

Signed-off-by: Gnanakeethan Balasubramaniam <gnanakeethan@gmail.com>

Signed-off-by: Gnanakeethan Balasubramaniam <gnanakeethan@gmail.com>

Signed-off-by: Gnanakeethan Balasubramaniam <gnanakeethan@gmail.com>

Summary: Foreign Key functions are now available
Signed-off-by: Gnanakeethan Balasubramaniam <gnanakeethan@gmail.com>

Signed-off-by: Gnanakeethan Balasubramaniam <gnanakeethan@gmail.com>

Signed-off-by: Gnanakeethan Balasubramaniam <gnanakeethan@gmail.com>

Summary: The database migrations now can be created using the methods on
the migration struct. it does not break any existing migration features.
it upgrades the migration struct and adds few more struct types so that
the migrations can be efficiently generated for create, alter, reverse,
drop.

Current Features:
* Supports creation of columns
   * `m.NewCol("name").SetDataType("VARCHAR(10)").SetNullable("true")`
   * **NOTE** `SetNullable` & `SetDefault` methods should not be called on
   same column for consistency
* Supports addition of primary keys
   * `m.PriCol("id").SetDataType("INT(10)").SetNullable("true")`
   * **NOTE** `setAuto(true)` can be only called on Primary keys
* Supports addition of unique keys
   * `m.UniCol("unique_index","column_name").SetDataType("VARCHAR(23)").SetNullable("true")`
   * **NOTE** `UniCol` can be called again with the same index name to
   add column to the index
* Supports rename of columns
   * `m.RenameColumn("from_name","to_name")`
   * Allows standard column methods and methods such that, `SetOldDefault` allows
   reversibility of renames

* TODO:
   * ForeignKey
Signed-off-by: Gnanakeethan Balasubramaniam <gnanakeethan@gmail.com>

validation: support required option for some struct tag valids

Provide permission to access old files to everyone

validation: support int64 int32 int16 and int8 type on 64-bit platform

support int64 on 64-bit platform

incorrect error rendering (wrong status)

fix panic sync: negative WaitGroup counter

AddAPPStartHook func modify

fix cache/memory fatal error: concurrent map iteration and map write

correctly handle multiple params with same type

Fix the new repo address for casbin.

v1.8.3