
It changes the behavior of the raise land and lower land tools to be drag- and dropable. I thought this would be nice to have because i always neglected them and used the level land tool instead.
You can still use them to raise or lower a single dot (only that now it's done on mouse_release not mouse_click) - and new: you can drag an area, and the whole area will be leveled to the level of starttile +1 or -1 when you raise or lower, respectively.
Note that it does not raise/lower each dot exactly by one. I thought about which of the two behaviors i want to make, and took the more level-ish one, because:
1) I think it's more intuitive / useful
2) It was easier to code

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Codewise, i decided to give CmdLevelLand a second parameter (it was unused before) that specifies the difference of height to level. e.g. if called with 0, it just levels (old behavior, used by level). if called with -1, it levels to start_tile's height -1 (used by lower). if called with +1 ut levels to start_tile's height +1 (used by raise).
theoretically, you could call it with +5 and it'll still work, leveling all to 5 higher than the start tile. but that is never used.
sooo what do you think? all kinds of reviews welcome

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Known Bugs:
none atm
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Screenshots ---
Credits
Thanks to:
boekabart, dihedral and frosch for your kind help

all who tested this and gave me feedback

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edit: Screenshots.
edit: Known Bug.
edit: Credits.
edit: new version.