(svn r2136) - Fix: [ 1174313 ] terrain hotkeys nonfunctional in scenario editor (D,Q,W,E,R,T,Y,U fltr)

- Fix: 'L' no longer opens ingame terraform bar in scenario editor bar, but the land generator one
- Feature: [ 1095110 ] Create Lake and draggable Create Desert tools (initial implementation GoneWacko), also added sticky buttons to land generator and town generator
- CodeChange: moved around some of the draggable tools, demystifying them
- CodeChange: change CmdBuildCanal to allow for XANDY dragging not only X or Y (only scenario editor)
- CodeChange: add some more enums to sprites.
- TODO: merge most of the ingame and scenario editor land terraform code. This can only be done after OnClickButton function is changed so it also includes the backreference to the widget being clicked, postponed to after 0.4.0

lang/english.txt

@@ -694,6 +694,7 @@ STR_028C_PLACE_ROCKY_AREAS_ON_LANDSCAPE				:{BLACK}Place rocky areas on landscap
 STR_028D_PLACE_LIGHTHOUSE					:{BLACK}Place lighthouse
 STR_028E_PLACE_TRANSMITTER					:{BLACK}Place transmitter
 STR_028F_DEFINE_DESERT_AREA					:{BLACK}Define desert area
+STR_CREATE_LAKE							:{BLACK}Define water area, will flood its surroundings if at sea level
 STR_0290_DELETE							:{BLACK}Delete
 STR_0291_DELETE_THIS_TOWN_COMPLETELY				:{BLACK}Delete this town completely
 STR_0292_SAVE_SCENARIO						:Save scenario