This update introduces a number of enhancements to the syntax and compiler, adds
a mechanism for passing macros via build command line arguments, and includes
various bug fixes.

v1.8.3

* Runtime
  * Added symbol declarations of the extension registers
* Syntax
  * Added support for single line `WHILE ... END WHILE` (without loop body)
  * Added support for single line `REPEAT ... UNTIL` (without loop body)
  * Added support for macro string as `DEF ... = "..."`
  * Added `DO NOTHING WITH ...` syntax (to avoid "Unused variable" warnings)
* Compiler and Asset Pipeline
  * Added compilation for single line `WHILE ... END WHILE`
  * Added compilation for single line `REPEAT ... UNTIL`
  * Added compilation for macro string as `DEF ... = "..."`
  * Added warning for unused variables
  * Fixed a compiling issue when declaring a macro which references identifiers from another code page
* Editor
  * Added support for passing macro definition from build parameters
  * Fixed a crash bug when reloading a running project which is launched from home screen
  * Fixed a waiting prompt closing issue
  * Fixed memory leak