Alpha v0.2.3 released

Thanks again to the alphatesters, many gameplay improves today!

[h3]Bugs[/h3]

• No bouncing back and forth between the two types of view when holding the control key.
  
• Football fields count correctly the number of green areas (1, not 4)
  
• Fixed asymmetry issue: 2x2 buildings are now considered all of them, not just the bottom corner.
  
• Fixed resource input problem when loading the game.
  
• In the desert biome, the stone now depletes correctly.
  

[h3]Gameplay[/h3]

• Hotkeys to build and change speed
  
• Trees are automatically removed when building roads
  
• When a building meets the requirements but has no space to appear, the size it needs, e.g. villas, is displayed.
  

[h3]UI[/h3]

• The area of influence of buildings same as the one being built is displayed.
  
• When hovering over resources, a tooltip shows an overview of total production per building.
  
• There are now tooltips for the building category buttons.
  
• The area of the coal plants is shown
  

[h3]Tutorial[/h3]

• Now shows the correct amount of green areas needed to unlock the nice park (30, not 20)
  
• Made it explicit that house upgrades are automatic, not manual.
  

[h3]Misc[/h3]

• Slowed walking by default in walk mode.