Changelog for hslua-core-2.1.0

Changelog

hslua-core uses PVP Versioning.

Released 29-01-2022.

The functions rawget, rawgeti, and getref now return the type of the value that was pushed to the stack.
A new function checkstack' is added to HsLua.Core.Auxiliary and exported from the main HsLua.Core module. The function throws an exception if the stack cannot be grown to accommodate a given number of elements; it is similar to luaL_checkstack.
Added function requiref, which safely wraps the unsafe luaL_requiref function.
New functions pcallTrace, callTrace, dostringTrace, and dofileTrace: behaves like the respective unsuffixed functions, but use a message handler that creates a stack traceback on error.
Added function rotate, wrapping lua_rotate.
Package helper requirehs signature changed to
```
requirehs :: LuaError e
          => Name                 -- ^ modname
          -> (Name -> LuaE e ())  -- ^ openf
          -> LuaE e ()
```
The function creating and pushing the module value now takes the module name as an argument. It also behaves more like luaL_requiref in that it reloads the module if the value in the LOADED table is falsy.

Released 2021-11-03.

Fixed output of pushTypeMismatchError when there is no value at the given index. Previously the function would report the value as type string and now reports it as no value.

Released 2021-10-29.

Fixed bug in pushTypeMismatchError. The function did not use an absolute stack index in one place, which sometimes lead to incorrect actual types being reported.

Released 2021-10-21.

Error handling has been reworked completely. The type of exceptions used and handled by HsLua is now exposed to the type system. The type Lua makes use of a default error type. Custom error handling can be implemented by using the LuaE type with an exception type that is an instance of class LuaError.
Added new module HsLua.Core.Userdata. It contains thin wrappers around the functions available for creating Haskell-value-wrapping userdata objects.
Added new module HsLua.Core.Closures, containing functions to expose Haskell functions to Lua.
Reverted to using the auxlib luaL_loadfile function to load a Lua file. Previously files were opened and read in Haskell, but some functionality of the auxlib function was missing.

Released 2021-02-27.

Extracted from hslua-1.3.0.