core: add mouse support (task #5435), free cursor movement, hook_focus, fix bugs with key "^" (bug #32072, bug #21381), fix bugs with bar windows, completion and /buffer

New features and bugs fixed:
- mouse support: new command /mouse, new option weechat.look.mouse, new key context "mouse"
- free movement of cursor: new command /cursor, new key context "cursor"
- new hook_focus (used by cursor and mouse)
- info "cursor_mode"
- bugs fixed with key "^"
- allow plugin name in /buffer name
- fix bugs with bar windows: do not create bar windows for hidden bars
- fix completion bug when two words for completion are equal but with different case
- automatic scroll direction in /bar scroll (x/y is now optional)

src/core/wee-string.h

@@ -22,6 +22,8 @@
 
 #include <regex.h>
 
+struct t_hashtable;
+
 extern char *string_strndup (const char *string, int length);
 extern void string_tolower (char *string);
 extern void string_toupper (char *string);
@@ -66,5 +68,8 @@ extern void string_encode_base64 (const char *from, int length, char *to);
 extern int string_decode_base64 (const char *from, char *to);
 extern int string_is_command_char (const char *string);
 extern const char *string_input_for_buffer (const char *string);
+extern char *string_replace_with_hashtable (const char *string,
+                                            struct t_hashtable *hashtable,
+                                            int *errors);
 
 #endif /* __WEECHAT_STRING_H */