* Tidy up first part of compiler code
* Rename Net Compiler Options
* Move CompilationErrors to Errors project
* Return default constructor to compiler warning
* Rename semantic check for include namespaces in unit
* Create two Errors files instead of one in Errors project
* Fix current unit is not main program check
* Add documentation to compilation errors in Errors project
* Return compiler thrown errors to Compiler project
* Refactor keywords class - extract base keywords functionality
* Fix keywords case sensitivity
* Fix case sensitivity again...
* Optimize keywords initialization
* Fix parse expression error because of wrong constructor call
