[Lazarus] "show declaration hints" has more power in it than is really used

[Michael Schnell]

  IMHO, Lazarus should hold a list of all public declarations done in 
the RTL and the LCL and when pressing F1 with the cursor on some name, 
it should show the appropriate help, even if  is not found in any unit 
mentioned in the uses clause - such as it works today. (providing a 
selection list when multiple alternatives are found).

-Michael