[lazarus] updates 2

[Mattias Gaertner]

Hi all,

- fixed crash if returned clipboard stream is empty
- linkscanner errors are now reported with filename and position
- linkscanner: {$C PRELOAD} is now recognized
- fixed parser:
   type a = string[]; is now recognized
   const a = ((())); is now recognized
   const a:pointer = nil; is now recognized
   type name = interface is now recognized
   var a: b= c; is now recognized
   procedure specifier 'assembler' is now recognized
   allows a few keywords in default parameters


Mattias