Delete last clip point

Signed-off-by: Kristian Duske <kristian.duske@gmail.com>
Popup menu and brush reparenting

Signed-off-by: Kristian Duske <kristian.duske@gmail.com>
Entity transformation
Render solid point entity bounding boxes with shading
Grid menu items

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