Several bug fixes

Signed-off-by: Kristian Duske <kristian.duske@gmail.com>
Add brush split mode to resize tool

Signed-off-by: Kristian Duske <kristian.duske@gmail.com>
Delete command

Signed-off-by: Kristian Duske <kristian.duske@gmail.com>
Render move indicators

Signed-off-by: Kristian Duske <kristian.duske@gmail.com>
Render coordinate system axes as long as the world bounds and always have them visible

Signed-off-by: Kristian Duske <kristian.duske@gmail.com>