0.9.9.3 - Minor update: movement speed multiplier (+ faster default), options and fixes

This minor update adds a movement speed multiplier option that allows tweaking the overall movement speed of the players. The default is now set to 1.05 (5% faster) instead of "classic" 1.00. There currently are five different settings, ranging from 0.9 (slowest) to 1.1 (fastest).

Also, a proper way to load default settings was added, as there is now a "reset options & keys" option that when set on clears the custom settings after exiting the game. Using it resets all the options to their default values, as well as clears the custom key configs.

Full changelog:

• Falling damage can now be used to get an indirect kill ("knocked kill")
• Added global movement speed multiplier option: allows adjusting the movement speed multiplier that gets applied on top of other movement adjustments
• Default movement speed multiplier increased to 1.05 (5% faster) from 1.00
• Resolution and window mode can now be set in the options, is applied when closing the menu
• Changing the language now reloads the menu
• Added an options for resetting defaults on exit; when set on, resets both keys