Fixed various typos and InnoSetup helper functions

* Fixed typos and ensured there's an EOL at end of files
* Removed Win9x functions in Inno Setup files as this is not supported
anymore
* Improved code quality of Inno Setup files
Integrated Inno Setup process with CMake

* Added separated iss file for configuration
* Inno Setup configuration is now computed at CMake time
* Added make installer target on Windows to launch the process
* Updated Windows README to include setup making notice