Use Joystick 1 and Joystick 2 by default if plugged in

See merge request !364

Joystick juggling

See merge request STJr/SRB2!355

Slightly re-organize DLLs and document the required list for bundling

See merge request !365

Make uninstaller a self-extractable

See merge request !367

Tiny Makefile Fix

See merge request STJr/SRB2!289

Add old-install-list.txt to explicitly define which old install files need to be moved

See merge request STJr/SRB2!366

Replaces MoveOldExeDlls routine in installer staging

Reason for this is because the SDL2 binaries live in libs/ for ease of copying. The DLLs ought to be in one location.

https://github.com/jrfonseca/drmingw/releases/tag/0.9.0

Update OSX icon

See merge request STJr/SRB2!363

Controller select menu improvements.

See merge request STJr/SRB2!354

Joystick additions for menu, axis defaults, and vertical look toggle

See merge request STJr/SRB2!359

Make mappable buttons for System Menu, Screenshot, Movie, and Viewpoint

See merge request STJr/SRB2!358

CMake:Use commit hash and branch name.

Closes #37

See merge request STJr/SRB2!360

Forgot a gitignore

See merge request STJr/SRB2!362

Installer followup

See merge request STJr/SRB2!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!

This reverts commit 9de31cf2.

* Add "Pause" entry to multiplayer control panel to give joy users a way to pause in netgames