Automation Fine adjustments modifier and show changed values

some FR for enhancements to automation edit
1: make a modifier key to fine adjust an automation edit so it wont jump high when editing (especially difficult when track is not zoomed to the max)
2: add info value next to the pointer when editing and adjusting automation lane. so if its volume lane, show the actual DB and the difference that made (like when adjusting event clip gain )
3: the combined tool (select + range) doesn’t always grab the value point ,and in general not only for automation the combined tool need some “bug” fixes