Merge. Due to my schizophrenia, I've accidentally forked my own code. The other set of changes were found in another computer.

Refactor cursor.

Refactor events.

Add cursesw driver, using curses get_wch() for unicode input. It alse has enabled keypad() to let curses interpret control keys and mouse input.

Update keypress propagation. Allow focus change by tab key. Add log property to Widget for smart logging.

Fix cursor.

Refactoring. Add ImmutablePoint.

Use Point for mouse events, add them to Container and Widget.

Update logging.

Update TextBox: Replace "spot" with "cursor".

Update TextField: Handle home, end keys.

Update TreeView (old uncommitted work).

Add old uncomitted docs.

Update TableView (old uncommitted work).

Update TableView (old uncommitted work).

Fix redraw of overlapping widgets inside AnchorLayout.

Add TextField widget, keypress event, cursor.

Add TextBox, text editor demo. Update demobase.

Refactoring: Swap drawing operations parameters. Coords are now last and have default values.

Add origin to Buffer. Use it to simplify hierarchical drawing.

Add Layout, FixedLayout.

Configure logging for demos.

Add clipping for Buffer draw operations.

Add timer, adjust inheritance of Widget, Container, Window.

Add Theme, Button.

Add WindowManager, basic event handling.

Add core Widget, Container. Add widgets Label.

Add core Application (adjusted), Window (new version), Signal (replaces Emitter), Size (adjusted). Add application demo.

Add colors to curses demo.

Refactor Driver, CursesDriver: draw, setattr, input.

Refactor Driver, CursesDriver: init, close, draw.

Fix original modules and demos.

Add frame method to Buffer.

Move UnicodeGraphics to core. Update it.

Add attribute storage to Buffer.

Add Buffer class with basic drawing methods.

Propagate "quit" event, do not just terminate application. Resize: flag widgets to be resized, do resizes only once before draw. Draw: flag widgets to be redrawn, do not draw everything on any event.

Update demo_input, demo_editor. Update ScrollView: show/hide scrollbars as needed on child size requests.

Clean up hints - add methods update_hint, hint_value to Widget. Split ScrollView into OffsetView and Scrolling components. Reimplement ScrollWindow using Scrolling component.

Add ScrollWindow. Rewrite EditBox to work with OffsetLayout. Add propery "exposed" to DrawEvent. Add Widget._view_size. Add config file (driver, log_level).

Add mousehover event (only SDL).

DriverSDL: Fix event dispatching. Add SDL events test.

Report mousemove relative position change. Window: when in AnchorLayout, aligned right/bottom - fix resizing by mouse to behave as expected.

Update drivers: Rename setcolor to defcolor, add real setcolor which ignores color stack. Application: Add overridable startup() method. Fix Widget draw clipping.

Add sdlterm to setup.py. Simplify color description, allow missing bg.

DriverCurses: filter mousemove - generate event only when coordinates changes.

DriverSDL: add support for key modifiers.

Fix.

DriverCurses: Add support for key modifiers.

Drop Container.offset, add special layout for that - OffsetLayout. Add Widget.bring_up(): moves child to end of children list.

Rework MenuBar. Add MenuButton. Add mouse event cascading to floaters. LinearLayout: spacing now applies to all children, not just those with expand. Fix Window resize request inside layouts. UnicodeGraphics: prepare for styling/theming.

Rework layouts: Layout is now normal Container which places its children upon resize event. Drop TopWindow, top is now any subclass of Container. Add floater concept: floaters are widgets drawn over normal widgets, not clipped by parent. Add HScrollbar and Scrollbar abstract base class.

DriverSDL: Fix.

DriverSDL: Implement blink attribute.

Cleanup timeouts.

sdlterm: Cleanup exceptions.

DriverSDL: Add support for timeouts.

Drop PyGame driver, replaced by compiled SDL driver.

DriverSDL: mousewheel, key repeation.

DriverSDL: system font lookup.