Merge pull request #354 from zsilencer/master

Decompiled audio functions
Set CMAKE_FIND_ROOT_PATH, use i686-w64-mingw32

The project now uses the MinGW headers instead of wine's headers.
install.sh: Download mingw from sourceforge.

It will automatically extract to /usr/local/
Extract with root privileges
Extract to subdirectory...
mkdir if it isn't present
Set the correct permissions after extracting.
Clean the code up (indentation)
Make toolchain compatible for both OSX and Linux
Merge pull request #358 from Balletie/master

Fix for blank screen at startup. (fixes #350)
Started reverse of viewport_update_position
First draft of viewport_update.
Not working
Fix bugs with viewport
Finished viewport_update_position.
Trying to find cause of subtle bug
Tidied up 689174. Fixed remaining small map bugs
Merge pull request #359 from duncanspumpkin/investigate_viewport

viewport update position
fixes #357, glitchy viewport dragging
Merge branch 'master' of https://github.com/IntelOrca/OpenRCT2.git
move input functions to input code file