Car GPS Expert, Speed Limit &Floating speedometer.

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===Add speed limit to any app ===
What's new in V5.7 :
1> Support 8 more speedometer bg color.
2> New Speed limit setting style.
3> Speed limit switch.
4> Support speedometer and limit icon size change.
5> Support Opacity change.
6> Fix bug: display partial content when km/h speed limit value > 100
7> Support tap to temporarily hide.
8> fix crash.