move variable declarations out of control structures to avoid warning on SC 3.15

[HotwheelsSisyphus]

Some of Jordan's recent work on SC's parser (PyrParseNode.cpp) seems to have resulted in SC now displaying "uninlineable" warnings on startup where it didn't previously... they're still just warnings, but it's easy enough to fix the scnvim code that generates them, so I did.

The warnings in question:

WARNING: FunctionDef contains variable declarations and so will not be inlined.
  in file '~/Code/scnvim/scide_scnvim/Classes/SCNvimDoc/SCNvimDoc.sc'
  line 265 char 63:
  			var keys = #[ "superclasses", "subclasses", "implementor" ];
                                                                 
  			klass.superclasses !? {
-----------------------------------
WARNING: FunctionDef contains variable declarations and so will not be inlined.
  in file '~/Code/scnvim/scide_scnvim/Classes/SCNvim.sc'
  line 230 char 106:
                            var description = "Snippet for %, auto generated by SCNvim".format(snippetName);
                                                                                                            
                              snippet = "s( {trig = \"%\", name = \"%\", dscr = \"%\" }, {%}),".format(snippetName, snippetName, description, snippet);
-----------------------------------

Everything works as before, but no warning on startup, and it saves you probably 0.0002 picoseconds of your precious time (very scientific estimate) because the code now presumably inlines properly.