wezterm: config restructure

gui/.config/wezterm/functions.lua

@@ -0,0 +1,16 @@
+local function get_os()
+    local current_os = os.getenv('OS')
+    if current_os then return current_os end
+    return io.popen('uname -s', 'r'):read()
+end
+
+local function set_by_os(values)
+    local my_os = get_os()
+    if values[my_os] then return values[my_os] end
+    return values.others
+end
+
+return {
+    set_by_os = set_by_os
+--    toggle_overrides = toggle_overrides
+}