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/plugins/plugin-api.c

@@ -50,6 +50,7 @@
 #include "../gui/gui-chat.h"
 #include "../gui/gui-completion.h"
 #include "../gui/gui-color.h"
+#include "../gui/gui-cursor.h"
 #include "../gui/gui-filter.h"
 #include "../gui/gui-history.h"
 #include "../gui/gui-hotlist.h"
@@ -365,6 +366,11 @@ plugin_api_info_get_internal (void *data, const char *info_name,
         snprintf (value, sizeof (value), "%d", gui_filters_enabled);
         return value;
     }
+    else if (string_strcasecmp (info_name, "cursor_mode") == 0)
+    {
+        snprintf (value, sizeof (value), "%d", gui_cursor_mode);
+        return value;
+    }
     
     /* info not found */
     return NULL;
@@ -997,6 +1003,8 @@ plugin_api_init ()
                &plugin_api_info_get_internal, NULL);
     hook_info (NULL, "filters_enabled", N_("1 if filters are enabled"), NULL,
                &plugin_api_info_get_internal, NULL);
+    hook_info (NULL, "cursor_mode", N_("1 if cursor mode is enabled"), NULL,
+               &plugin_api_info_get_internal, NULL);
     
     /* WeeChat core infolist hooks */
     hook_infolist (NULL, "bar", N_("list of bars"),
@@ -1064,6 +1072,8 @@ plugin_api_init ()
                 &gui_bar_hdata_bar_cb, NULL);
     hook_hdata (NULL, "bar_item", N_("bar item"),
                 &gui_bar_item_hdata_bar_item_cb, NULL);
+    hook_hdata (NULL, "bar_window", N_("bar window"),
+                &gui_bar_window_hdata_bar_window_cb, NULL);
     hook_hdata (NULL, "buffer", N_("buffer"),
                 &gui_buffer_hdata_buffer_cb, NULL);
     hook_hdata (NULL, "completion", N_("structure with completion"),