KonsolScript and Game Engine Code

Shape Rotation functionality
* implemented Shape Rotation functionality
* implemented multi-selection via SHIFT KEY
* minor code cleanup

Zoom Tool Implementation
* implemented primitive Zoom-In/Out
* applied zoom-in/out to undo-stack
* changed Stage width/height from unsigned int to double for better zoom-in/out handling
* made stage non-viewable area a bit darker
* improved handling of Shape selection by disregarding mouse-over as act of "selecting"
* minor code cleanup

More Node-editing improvements
* implemeted deletion of multi-selected Nodes
* more refactoring on handleNodes_relocation and handleNodes_rendering
* improved handling of Node editing
* prevented selection of non-Curve/Line nodes
* addressed all Compile Warnings
* minor code cleanup

Supported Node-editing of multiple-selected Nodes

Attempt to refactor Node-handling to fix current Node-handling glitch

Minor updates
* exporting AVI will include selected background color
* updated stage width/height/background color
* updated GtkEntry's width on Properties pane

File->New optimization
* cleaned-up Kage constructor
* cleaned-up KageStage constructor
* fixed rendering problem of Node-editing
* minor code cleanup

Fixes here and there
* added state of blank upon File->New
* fixed bug on updateShapeColor not updating
* fixed bug on updateShapeX not updating
* fixed bug on updateShapeY not updating

Undo/Redo initial implementation on resizing/relocating shape/s
* wrote Undo/Redo via stacking of vector of VectorData
* implemented Undo_onClick/Redo_onClick
* attempt to fix PixbufError on Windows
* minor code cleanup

Missed updating Properties Pane on newly re-written KageStage::trySingleSelectShape()