Extend tiling/floating criteria with optional auto/user values (#4006)

The default `tiling` and `floating` behavior is preserved and matches
both cases.

Adds a new handler to `remanage_window` on A_I3_FLOATING_WINDOW change.

Mainly in order to `run_assignments`, this makes `for_window [floating]`
directives to work for windows which where initially opened as tiling.
Now, when floating is enabled, `for_window` will trigger correctly. Same
applies to `for_window [tiling]`.

The obvious solution of `run_assignments` after
`floating_{enable,disable}` doesn't work because `run_assignments`
modifies the parser state in src/assignments.c:51.

Fixes #3588

Co-Authored-By: Michael Stapelberg <michael@stapelberg.de>

parser-specs/config.spec

@@ -181,16 +181,18 @@ state NO_FOCUS_END:
 
 # Criteria: Used by for_window and assign.
 state CRITERIA:
-  ctype = 'class'       -> CRITERION
-  ctype = 'instance'    -> CRITERION
-  ctype = 'window_role' -> CRITERION
-  ctype = 'con_id'      -> CRITERION
-  ctype = 'id'          -> CRITERION
-  ctype = 'window_type' -> CRITERION
-  ctype = 'con_mark'    -> CRITERION
-  ctype = 'title'       -> CRITERION
-  ctype = 'urgent'      -> CRITERION
-  ctype = 'workspace'   -> CRITERION
+  ctype = 'class'         -> CRITERION
+  ctype = 'instance'      -> CRITERION
+  ctype = 'window_role'   -> CRITERION
+  ctype = 'con_id'        -> CRITERION
+  ctype = 'id'            -> CRITERION
+  ctype = 'window_type'   -> CRITERION
+  ctype = 'con_mark'      -> CRITERION
+  ctype = 'title'         -> CRITERION
+  ctype = 'urgent'        -> CRITERION
+  ctype = 'workspace'     -> CRITERION
+  ctype = 'floating_from' -> CRITERION_FROM
+  ctype = 'tiling_from'   -> CRITERION_FROM
   ctype = 'tiling', 'floating'
       -> call cfg_criteria_add($ctype, NULL); CRITERIA
   ']'
@@ -199,6 +201,22 @@ state CRITERIA:
 state CRITERION:
   '=' -> CRITERION_STR
 
+state CRITERION_FROM:
+  '=' -> CRITERION_FROM_STR_START
+
+state CRITERION_FROM_STR_START:
+  '"' -> CRITERION_FROM_STR
+  kind = 'auto', 'user'
+    -> call cfg_criteria_add($ctype, $kind); CRITERIA
+
+state CRITERION_FROM_STR:
+  kind = 'auto', 'user'
+    -> CRITERION_FROM_STR_END
+
+state CRITERION_FROM_STR_END:
+  '"'
+    -> call cfg_criteria_add($ctype, $kind); CRITERIA
+
 state CRITERION_STR:
   cvalue = word
       -> call cfg_criteria_add($ctype, $cvalue); CRITERIA