Add action to select new targets (#2707)

Adds a new selection while preserving existing ones
`"append <target>"` replaces `"take this and <target>"`

You can also use `append pre` and `append post` to add a cursor before
or after the given target (rather than selecting that target), while
keeping your current selections unchanged. (Previously you could do
something like `pre this and <target>` but this would also reduce your
current selection to a cursor before the current target.)

## Checklist

- [x] I have added
[tests](https://www.cursorless.org/docs/contributing/test-case-recorder/)
- [x] I have updated the
[docs](https://github.com/cursorless-dev/cursorless/tree/main/docs) and
[cheatsheet](https://github.com/cursorless-dev/cursorless/tree/main/cursorless-talon/src/cheatsheet)
- [x] I have not broken the cheatsheet

---------

Co-authored-by: Phil Cohen <[email protected]>

Author: AndreasArvidsson

src/spoken_forms.json

@@ -2,9 +2,12 @@
   "NOTE FOR USERS": "Please don't edit this json file; see https://www.cursorless.org/docs/user/customization",
   "actions.csv": {
     "simple_action": {
+      "append post": "addSelectionAfter",
+      "append pre": "addSelectionBefore",
+      "append": "addSelection",
       "bottom": "scrollToBottom",
-      "break": "breakLine",
       "break point": "toggleLineBreakpoint",
+      "break": "breakLine",
       "carve": "cutToClipboard",
       "center": "scrollToCenter",
       "change": "clearAndSetSelection",
@@ -22,8 +25,8 @@
       "extract": "extractVariable",
       "float": "insertEmptyLineAfter",
       "fold": "foldRegion",
-      "follow": "followLink",
       "follow split": "followLinkAside",
+      "follow": "followLink",
       "give": "deselect",
       "highlight": "highlight",
       "hover": "showHover",
@@ -39,8 +42,8 @@
       "reference": "showReferences",
       "rename": "rename",
       "reverse": "reverseTargets",
-      "scout": "findInDocument",
       "scout all": "findInWorkspace",
+      "scout": "findInDocument",
       "shuffle": "randomizeTargets",
       "snippet make": "generateSnippet",
       "sort": "sortTargets",