Align queries with 'nvim-treesitter'

I fear the upstream queries may be broken, somehow, as they don't work
with `--apply-all-captures` which should match the "last query wins"
matching behaviour of `nvim-treesitter`.

I also removed `locals.scm`, as `tree-sitter` and `nvim-treesitter` don't
agree on how to write it, and I don't really care about it.

It does mean that the highlights can't tell the difference between `int`
the built-in and `int` the type alias anymore, but that's a small
edge-case (and `nvim-treesitter` didn't support it anyway).

test/highlight/identifiers.tig

@@ -6,24 +6,24 @@ type int_array = array of int
 /*                        ^ type.builtin */
 
 type record = {a: int, b: string}
-/*             ^ property */
+/*             ^ variable.member */
 /*                ^ type.builtin */
-/*                     ^ property */
+/*                     ^ variable.member */
 /*                        ^ type.builtin */
 
 var record := record {a = 12, b = "27"}
 /*  ^ variable */
 /*            ^ type */
-/*                    ^ property */
-/*                            ^ property */
+/*                    ^ variable.member */
+/*                            ^ variable.member */
 
 var array := int_array[12] of 27;
 /*  ^ variable */
 /*           ^ type */
 
 primitive func(a: int, b: string) : array
-/*             ^ parameter */
+/*             ^ variable.parameter */
 /*                ^ type.builtin */
-/*                     ^ parameter */
+/*                     ^ variable.parameter */
 /*                        ^ type.builtin */
 /*                                  ^ type */