maint: Use Octave convention for spacing of C++ cast statements. * PopupMenuControl.cc, __dsearchn__.cc, __magick_read__.cc, cellfun.cc, gl-render.cc, ls-mat5.cc, mex.cc, tsearch.cc, ccolamd.cc, dmperm.cc, ov-bool-mat.h, ov-bool-sparse.cc, ov-cx-mat.cc, ov-cx-sparse.cc, ov-fcn-handle.cc, ov-flt-cx-mat.cc, ov-flt-re-mat.cc, ov-range.cc, ov-re-mat.cc, ov-re-sparse.cc, jit-typeinfo.cc, jit-typeinfo.h, CDiagMatrix.cc, CSparse.cc, MatrixType.h, chNDArray.cc, dDiagMatrix.cc, dNDArray.cc, dSparse.cc, fCDiagMatrix.cc, fDiagMatrix.cc, fNDArray.cc, eigs-base.cc, oct-fftw.cc, sparse-chol.cc, url-transfer.cc: Change cast statements to use no space between cast and '<...>' and one space before the opening '('.

--- a/libinterp/corefcn/cellfun.cc	Thu Jul 26 14:44:36 2018 -0700
+++ b/libinterp/corefcn/cellfun.cc	Thu Jul 26 16:32:12 2018 -0700
@@ -99,7 +99,7 @@
           msg.assign ("message", last_error_message ());
           msg.assign ("index",
                       static_cast<double> (count
-                                           + static_cast<octave_idx_type>(1)));
+                                           + static_cast<octave_idx_type> (1)));
 
           octave_value_list errlist = inputlist;
           errlist.prepend (msg);