add View.zoom_fit functionality; add Numeric.clamp method; add Filehandler as base for load and save functionality
add gtk3 dependency to the readme; cleanup code formatting
improve PadGroup::get_extend and ::at_pos methods
add copyright notice for the icons
move text rendering from Pedder::Texts to Pedder::Text; add highlit state to Pedder::Text
add ToDo list
add Authors file
allow to pan the area with the middle mouse button