Created River Editor (asciidoc)

River-Editor.asciidoc

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+*River Editor* is aimed to individually edit existing river or create a new river. To open the Editor click on any river.
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+Buttons:
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+* Risize () - ability to rotate and re-scale the river, it may be a bit buggy, please use wisely
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+* Renegerate () - regenerate river based on main points, the river width will be randomized so the button could be also used to change the river width
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+* Add point (+) - click on the map to add new river point and re-draw a river. 
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+* Remove point (-) - click on a river point to remove it and re-draw a river
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+* Copy () - copy river and place near the selected one
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+* Remove () - remove the river (the action cannot be canceled)
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+* New River (+) - click on the map to create a new river and define a river course. Click on added point or river course to finish the river creation 
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