This release mainly includes numerous improvements to the BASIC compiler. Which
includes a new constant folding mechanism, enhancements to macros - and
leveraging these features - optimizations in expression evaluation, and
conditional compilation directives as `#IF ... #ELSE IF ... #ELSE ... #END IF`
allow static determination of which code participates in compilation. The new
`#MESSAGE ...`, `#WARN ...`, and `#ERROR ...` diagnostic directives help provide
custom compile-time feedbacks. It also includes enhanced `FOR`, `WHILE`, and
`REPEAT` loops to support more flexible single-line syntax. `BANKOF(lbl)` and
`ADDRESSOF(lbl)` now support code labels as arguments. This update also contains
other feature improvements and bug fixes.

v1.9

* Runtime
  * Fixed a value retrieving bug for signed 8-bit integers in expressions
* Syntax
  * Added a dummy shell command
  * Added support for single line `FOR ... NEXT`
  * Added conditional compilation directives `#IF ... #ELSE IF ... #ELSE ... #END IF`
  * Added compile-time diagnostics `#MESSAGE ...`, `#WARN ...`, and `#ERROR ...`
* Compiler and Asset Pipeline
  * Added compilation for single line `FOR ... NEXT` with loop body
  * Added compilation for single line `WHILE ... END WHILE` with loop body
  * Added compilation for single line `REPEAT ... UNTIL` with loop body
  * Added compilation for `BANKOF(lbl)`， `ADDRESSOF(lbl)` where `lbl` is a jump label in code
  * Added default project-related macro definitions
  * Added constant expression folding
  * Fixed a code destination lookup issue as `#n:lbl`
* Emulator
  * Added handling of dummy shell commands as placeholder (for user customization by modifying the source code)
* Editor
  * Added a field for filling pre-defined macros in the project properties dialog
  * Added a project option for compilation optimization
  * Fixed a crash bug when editing SGB properties of a project from the home screen
* Document, Examples, Starter Kits, Tutorials and Help
  * Added document about conditional compilation
  * Fixed an in-page program loading bug with translated mode