Console improvements

[jakubg1]

The console available in Ctrl+` is currently in a bad state. Most of the commands do not work anymore, some even crash the game. A console rework is planned. New features should include:

• Command history
• Scrollable console history
• Cursor positioning (i.e. to add something in the middle)
• A whole new slew of commands
• Command autofill and hints
• Command syntax changed to function call-like (for example, setLives(3))
• And probably more...

[jakubg1]

Example commands:

• collectible <name> - Spawn a collectible
• setlives <count> - Set the amount of lives on a player
• setcoins <count> - Same but for coins
• setscore <count> - ditto
• setdiff <difficulty> - Set the difficulty
• warp <level> - Immediately load a level and play it (omit level sequences? to be seen)

[jakubg1]

Command history has been implemented here: fcbb6aa
A help command has been implemented here: b302fa5
Pasting into the console has been implemented here: 7d2f88a