Add a script to install / update Inno Setup to the mingwGitDevEnv root

Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>
Make ignore rules non-recursive

Otherwise e.g. Inno Setup binaries would be ignored.

Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>
installer: Add Inno Setup 5.5.2 Unicode to the repository

Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>
Use the committed Inno Setup to build the installer

Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>