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.

CXXFLAGS=`sdl-config --cflags` -g -Wall -std=c++11 -Isrc
LDFLAGS=`sdl-config --libs` -lSDL_ttf
VPATH=src

demo: demo.cc sdlterm.cc sdlterm.h

clean:
	rm -f demo