Support mouse scrolling.

Fixes #27
The minor drawback is that it doesn't take the horizontal text limit into account when scrolling to the right.
One can keep scrolling WAAAAAY after all chars have disappeared to the left.

apparently BASS_Init is output-only and is not needed for recording-only (http://www.un4seen.com/forum/?topic=17217.0 - thx Ian)

Switch from SDL2 to GLFW3.2

This eases building since GLFW is embedded and compiled along Bonzomatic with minimal dependancies.

Better way to find SDL2 (especially on OSX) + CMakeList cleanups.

Reorganize the file structure

add CI-travis support

add appveyor build thingie

Switch to CMake build system

- Change file structure to separate code from data and 3rdparty binaries.
- Move from make and VS solutions to cmake build system.

Add missing include for memcpy

Added support for cmd keys for OS X