Complete the changelog for 0.9.21

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I guess the release of 0.9.21 is getting close, so I think we should collect 
new stuff which is not mentioned in the changelog so far.

Here is a list of changes which aren’t in the changelog so far:

 + New game play mode "DiagonalMaze" (generates a simple diagonal maze)
 + Add 7 target practice missions, now with simple scoring
 + Update RC Plane Challenge: Stats screen reworked and shows now several facts, simple ranking system based on used planes, some taunts in the game
 + Hand-drawn maps editor allows maps to be optimized for file size
 + Style of world edge type "Wrap" changed, you now can see the other side of the border in darker color
 + Style of world edge type "Bounce" changed

 Lua API:
 + New library: Params, makes parsing of script parameters easier
 + New library: TargetPractice, used to generate target practice missions (the newly added missions use it)

Feel free to post here if you find more missing stuff in the changelog.

Original issue reported on code.google.com by almikes@aol.com on 22 Dec 2014 at 5:07

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r2d0a0d9a695c

Original comment by kyberneticist@gmail.com on 24 Dec 2014 at 4:15

• Changed state: Fixed