I initially misread the specification.  src0.x is the iteration count,
not the max amount for the loop register.  This fixes that.

- Separate the declaration phase of the shader string generator into
  the arb and glsl specific files.
- Add declarations and recognition for application-sent constant
  integers and booleans (locally defined ones will follow).
- Standardize capitilization of pixel/vertex specific variable names.

- Moves GLSL constant loading code into glsl_shader.c and out of the
  over-populated drawprim.c.
- Creates a new file named arb_program_shader.c which will hold code
  specific to ARB_vertex_program & ARB_fragment_program.
- Remove the constant loading calls from drawprim.c

(vertical scrollbar position was not taken into account).

start of the NtOpenSymbolicLinkObject, therefore ObjectAttributes does
not need to be checked for NULL later on in the function.

This reduces the number of server calls during a COM call by half.