modules: move 'content' and 'anchors' to MODULE_COMMON_ATTRS

All modules implement these. The only one that differs is the i3
module. It still implements them, but 'content' uses an internal
verifier function.

module.h

@@ -34,6 +34,8 @@ struct exposable *module_begin_expose(struct module *mod);
 
 /* List of attributes *all* modules implement */
 #define MODULE_COMMON_ATTRS                        \
+    {"content", true, &conf_verify_particle},      \
+    {"anchors", false, NULL},                      \
     {"font", false, &conf_verify_font},            \
     {"foreground", false, &conf_verify_color},     \
     {NULL, false, NULL}

modules/alsa.c

@@ -302,8 +302,6 @@ verify_conf(keychain_t *chain, const struct yml_node *node)
     static const struct attr_info attrs[] = {
         {"card", true, &conf_verify_string},
         {"mixer", true, &conf_verify_string},
-        {"content", true, &conf_verify_particle},
-        {"anchors", false, NULL},
         MODULE_COMMON_ATTRS,
     };
 

modules/backlight.c

@@ -233,8 +233,6 @@ verify_conf(keychain_t *chain, const struct yml_node *node)
 {
     static const struct attr_info attrs[] = {
         {"name", true, &conf_verify_string},
-        {"content", true, &conf_verify_particle},
-        {"anchors", false, NULL},
         MODULE_COMMON_ATTRS,
     };
 

modules/battery.c

@@ -360,8 +360,6 @@ verify_conf(keychain_t *chain, const struct yml_node *node)
     static const struct attr_info attrs[] = {
         {"name", true, &conf_verify_string},
         {"poll-interval", false, &conf_verify_int},
-        {"content", true, &conf_verify_particle},
-        {"anchors", false, NULL},
         MODULE_COMMON_ATTRS,
     };
 

modules/clock.c

@@ -114,8 +114,6 @@ verify_conf(keychain_t *chain, const struct yml_node *node)
     static const struct attr_info attrs[] = {
         {"date-format", false, &conf_verify_string},
         {"time-format", false, &conf_verify_string},
-        {"content", true, &conf_verify_particle},
-        {"anchors", false, NULL},
         MODULE_COMMON_ATTRS,
     };
 

modules/i3.c

@@ -651,7 +651,7 @@ verify_conf(keychain_t *chain, const struct yml_node *node)
         {"right-spacing", false, &conf_verify_int},
         {"content", true, &verify_content},
         {"anchors", false, NULL},
-        MODULE_COMMON_ATTRS,
+        {NULL, false, NULL},
     };
 
     return conf_verify_dict(chain, node, attrs);

modules/label.c

@@ -59,8 +59,6 @@ static bool
 verify_conf(keychain_t *chain, const struct yml_node *node)
 {
     static const struct attr_info attrs[] = {
-        {"content", true, &conf_verify_particle},
-        {"anchors", false, NULL},
         MODULE_COMMON_ATTRS,
     };
 

modules/mpd.c

@@ -610,8 +610,6 @@ verify_conf(keychain_t *chain, const struct yml_node *node)
     static const struct attr_info attrs[] = {
         {"host", true, &conf_verify_string},
         {"port", false, &conf_verify_int},
-        {"content", true, &conf_verify_particle},
-        {"anchors", false, NULL},
         MODULE_COMMON_ATTRS,
     };
 

modules/network.c

@@ -544,8 +544,6 @@ verify_conf(keychain_t *chain, const struct yml_node *node)
 {
     static const struct attr_info attrs[] = {
         {"name", true, &conf_verify_string},
-        {"content", true, &conf_verify_particle},
-        {"anchors", false, NULL},
         MODULE_COMMON_ATTRS,
     };
 

modules/removables.c

@@ -582,8 +582,6 @@ verify_conf(keychain_t *chain, const struct yml_node *node)
         {"spacing", false, &conf_verify_int},
         {"left-spacing", false, &conf_verify_int},
         {"right-spacing", false, &conf_verify_int},
-        {"content", true, &conf_verify_particle},
-        {"anchors", false, NULL},
         MODULE_COMMON_ATTRS,
     };
 

modules/sway_xkb.c

@@ -350,8 +350,6 @@ verify_conf(keychain_t *chain, const struct yml_node *node)
         {"left-spacing", false, &conf_verify_int},
         {"right-spacing", false, &conf_verify_int},
         {"identifiers", true, &verify_identifiers},
-        {"content", true, &conf_verify_particle},
-        {"anchors", false, NULL},
         MODULE_COMMON_ATTRS,
     };
 

modules/xkb.c

@@ -664,8 +664,6 @@ static bool
 verify_conf(keychain_t *chain, const struct yml_node *node)
 {
     static const struct attr_info attrs[] = {
-        {"content", true, &conf_verify_particle},
-        {"anchors", false, NULL},
         MODULE_COMMON_ATTRS,
     };
 

modules/xwindow.c

@@ -346,8 +346,6 @@ static bool
 verify_conf(keychain_t *chain, const struct yml_node *node)
 {
     static const struct attr_info attrs[] = {
-        {"content", true, &conf_verify_particle},
-        {"anchors", false, NULL},
         MODULE_COMMON_ATTRS,
     };