Vector types (SIMD): f32x8, i8x32, f64x4 and the rest; --cpu native

- fNxM / iNxM / uNxM up to 512 bits, as LLVM vectors (<8 x float>): LLVM picks SSE, AVX2,
  AVX-512 or NEON for them
- f32x8(x) in every lane, f32x8(a, ..., h), f32x8(list, i) loads, f32x8(i32x8 v) converts
- + - * / and the bit operators lane by lane, with a plain number on either side counting for every lane;
  v[i], v[i] = x, v.len, == / != (every lane), print and str
- methods: sum min max dot abs sqrt floor ceil round fma store; min/max/abs/clamp lane by lane
- wide vectors (and structs holding them) are loaded and stored with align 16, what malloc and the stack give
- --cpu <name> (and cpu = "..." in finch.toml): native, x86-64-v3, apple-m1, ...
- debug info shows vectors; the language server completes their methods; Kate and VS Code highlight them
- f32 x = -1.5 works: a minus in front of a float written in the code keeps it such a number

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Psc42moPLwP43Cmb9oZqSR

editors/kate/finch.xml

@@ -5,7 +5,7 @@
   Install: copy to ~/.local/share/org.kde.syntax-highlighting/syntax/finch.xml
   (or run editors/kate/install.sh), then restart Kate.
 -->
-<language name="Finch" version="4" kateversion="5.0" section="Sources" extensions="*.fch"
+<language name="Finch" version="5" kateversion="5.0" section="Sources" extensions="*.fch"
           mimetype="text/x-finch" indenter="cstyle" author="The Finch authors" license="Apache-2.0">
   <highlighting>
     <list name="keywords">
@@ -103,6 +103,8 @@
         <keyword String="imports" attribute="Import"/>
         <keyword String="constants" attribute="Constant"/>
         <keyword String="types" attribute="Data Type"/>
+        <!-- vectors: f32x8, i8x32, u16x16, f64x4 ... -->
+        <RegExpr String="\b[iuf](8|16|32|64)x(2|4|8|16|32|64)\b" attribute="Data Type"/>
         <keyword String="builtins" attribute="Built-in"/>
 
         <RegExpr String="\b0[xX][0-9a-fA-F_]+\b" attribute="Hex"/>