Controller select menu improvements.

See merge request !354

CMake:Use commit hash and branch name.

Closes #37

See merge request !360

Forgot a gitignore

See merge request !362

Installer followup

See merge request !361

* Check if administrator rights are required
* Add INSTALL INSTRUCTIONS text file to root install folder in case the installer fails
* Add failsafes to uninstaller file deletion: check if name is a folder, and check for illegal chars
* Fixed parentheses breaking the installer by instead making exclamation marks do the breaking. Thanks Windows!

Controller name fix

See merge request SteelTitanium/SRB2!2

Add new Windows installer scripts

See merge request !356

Update debian packaging to work with Launchpad PPA

See merge request !350

Save sound toggles to config

See merge request STJr/SRB2!348

This reverts commit fd12e856.