64bit internal values as the default format in winebdg command imposes.

- more strickling differentiation variable location between 
  a register, and the dereferenced address defined by a
  register (and possibly an offset)
- added a parameter to symt_add_func_local (and internal symbol
  data struct) to help differentiate
- fix all debug parsers to confer to this new scheme

Also rename W-string variable to get some naming consistency.

That fixes compilation with gl headers that do not know about glUniform4fvARB.

Spotted by and adapted from test written by Tobias Ringström.