- Upgraded to TypeScript 4.6

- Added two event hooks to TSTL plugins: `beforeTransform` and `afterPrint`

- These allow you to run plugin code at specific points in the transpilation process.

- Lualib polyfills are now modules required into locals, instead of global functions

- This change also removes the `"always"` option for the `"lualibImport"` tsconfig key.

- Added support for `Math.sign`

- Switched to `^` instead of `math.pow`, the latter was deprecated in 5.3

- Added an error when using `null` or `undefined` in tuples, as that is undefined behavior in the Lua spec and causes unexpected behavior

- Added tsconfig setting `extension`, allowing to specify a different output file extension

- Fixed multiple issues with optional chaining and lualib/language extensions

- Fixed issue assigning function with properties to variable declarations

- Fixed multiple issues with preceding statements in class constructors

- Fixed external code module resolution exploding into a stack overflow in complicated module hierarchies

- Fixed a `function.apply(context)` breaking the transpiler if called with only one parameter

- Fixed preceding statements in ternary conditionals (`x ? y : z`) leading to incorrect code