Changes to pychan and FIFE in editor rewrite branch

Details: SVN diff

Changes which may break compatibility with existing clients are marked with CW:

Layer: New function to retrive instances at a location: std::vector<Instance*> getInstancesAt(Location& loc, bool use_exactcoordinates=false);
GuiManager: Proper translation of Guichan key events to FIFE key events
CW: ClickLabel: Labels will get their background painted
ToggleButton: Proper size calculation
Cursor: Support for native cursors
- CW: XCursor is now a dependency on linux systems.
CW: CellSelectionRenderer: Modified to support selection of multiple cells
TimeManager: Fix for update()

CW: Greedy layout engine activated
- Widgets is now able to expand if vexpand or hexpand is set to 1. Setting vexpand or hexpand to > 1 will make them more greedy
CW: Private variable _parent renamed to __parent. DO NOT USE PYCHAN VARIABLES OR METHODS PREFIXED WITH A UNDERSCORE (_)! These are private/protected and may change. Use the property parent instead. Use size instead of _size, width=100, instead of _setWidth(100), etc
Internal:
- New property: allWidgets
- Background color of Labels set to transparent
Buttons: Fixed a few bugs regarding size calculation
Widget:
- New method: InsertChild(widget, position). Inserts a widget at position in widget list
- New method: InsertChildBefore(widget, beforeWidget). Inserts a widget right before another widget
- New property: is_focusable
- New properties: min_size, max_size
Scrollarea:
- CW: Size is not static anymore
Events:
- Events are called outside of pychan logic functions using timers.
- Fixed an error when an event was called on a deleted widget

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