Adjust result height for raycasting
Fixes for MSVC CMake build.

Look in the right place for SDL libs depending on arch.
Output exe's to RecastDemo/Bin, with output suffix so different
configs don't clash.
Added Linux build exe to gitignore.
Updated build system to premake4
Updates for readme
Quick fix for Win32. Need to handle linking to SDL for x64 still.
Fixed bug where debug and release libs would have the same file path.

This broke make when switching between debug and release configs.
Generate debug symbols in release builds and use fast floats.
Merge remote-tracking branch 'upstream/master'