Fixed: arrow cursor when the cursor is hover a CPTextField

Previously, when the cursor was hover a CPTextField the cursor was an arrow till we selected the textField.
Now when the cursor is hover a CPTextField, and if this textField is enabled and editable or selectable we show the selecting cursor. This is the default behavior in Cocoa as well.

Updated manual test Tests/Manual/CPTextField/
Fixed: optimization about setting the good cursor for a CPTextField
Merge pull request #2233 from Dogild/cursorTextField

Fixed: arrow cursor when the cursor is hover a CPTextField