Add new fuzzers for command parsing, formats and styles, from David Korczynski

in GitHub issue 4957.

fuzz/format-fuzzer.dict

@@ -0,0 +1,71 @@
+# Format expansion syntax
+"#{"
+"}"
+"#{?"
+"#{=="
+"#{!="
+"#{<"
+"#{>"
+"#{m:"
+"#{C:"
+"#{s/"
+"#{t:"
+"#{T:"
+"#{E:"
+"#{S:"
+"#{W:"
+"#{P:"
+"##"
+
+# Common format modifiers
+"b:"
+"d:"
+"q:"
+"l:"
+"e:"
+"t:"
+"p:"
+"w:"
+"n:"
+"a:"
+"=:"
+"||"
+"&&"
+","
+"#{e|"
+"#{p-1:"
+"#{=/10/...:"
+
+# Format variables
+"session_name"
+"window_index"
+"window_name"
+"pane_index"
+"pane_id"
+"host"
+"pane_width"
+"pane_height"
+"pane_current_command"
+"pane_pid"
+"session_id"
+"window_id"
+"client_name"
+"version"
+"line"
+
+# Conditionals
+"#{?pane_active,"
+",}"
+"#{?#{==:"
+
+# Math and comparison
+"#{e|+:"
+"#{e|-:"
+"#{e|*:"
+"#{e|/:"
+"#{e|%:"
+
+# Nested
+"#{="
+"#{"
+"#{l:"