Realised uniform motion of player in 8 direction

Changed lua/state/game.lua - add motion vector.
Changed lua/player.lua - add uniform motion vector calculation
Add uniform motion in 8 direction

Change 'lua/player.lua' --> Add motion vector calculation. (or sort of)
Change 'lua/states/game.lua' --> Realised direction vector to uniform
motion calculation in 'lua/player.lua'
Merge branch 'eight_direction_player_movement' of https://github.com/niksaak/machine into eight_direction_player_movement

Conflicts:
	lua/player.lua
	lua/states/game.lua
Fix some addition bugs.

This piece of code write some information from dif-file to my code. I'm
hate it.
fix leftover merge conflict
remove unused vars, add useful comment
tweak player speed up a little
Merge branch 'eight_direction_player_movement'

* eight_direction_player_movement:
  tweak player speed up a little
  remove unused vars, add useful comment
  fix leftover merge conflict
  Fix some addition bugs.
  Add uniform motion in 8 direction
  Realised uniform motion of player in 8 direction