initial commit
separate actions
make toolbar and statusbar hidable
add empty tools
set central widget
connect tool open actions
fix typo
add project checking
store absolute path
create basic layout of bgm player
icon only in toolbar
use VideoPlayer as member and specify correct parent to control_'s layout
implement music file listing
add material list viewer GUI
add filter list widget
use png by default
list all empty tab
load database and maptree in openProject
api change to lcf_reader
use white icon