* Implemented stack-based active map in Keymapper
* Started proper testing by adding code to OSystem_SDL to set up simple HardwareKeySet and Keymap
svn-id: r33660
- Refactoring of code to map a key to a UserAction - now we call a method on UserAction to do it (and it then tells the Keymap class)
- General cleanup of code
svn-id: r33262
Further development of Keymapper interface:
- switchKeymap method to change Keymaps
- initGame/deInitGame methods to control loading/unloading of game-specific maps
svn-id: r33173
