rename many _p9k_ vars to _p9k__; trigger state dump when timewarrior and asdf caches change

internal/icons.zsh

@@ -1,8 +1,8 @@
 typeset -gA icons
 
 function _p9k_init_icons() {
-  [[ $+_p9k_icon_mode == 1 && $_p9k_icon_mode == $POWERLEVEL9K_MODE/$POWERLEVEL9K_LEGACY_ICON_SPACING ]] && return
-  typeset -g _p9k_icon_mode=$POWERLEVEL9K_MODE/$POWERLEVEL9K_LEGACY_ICON_SPACING
+  [[ $+_p9k__icon_mode == 1 && $_p9k__icon_mode == $POWERLEVEL9K_MODE/$POWERLEVEL9K_LEGACY_ICON_SPACING ]] && return
+  typeset -g _p9k__icon_mode=$POWERLEVEL9K_MODE/$POWERLEVEL9K_LEGACY_ICON_SPACING
 
   if [[ $POWERLEVEL9K_LEGACY_ICON_SPACING == true ]]; then
     local s=

internal/worker.zsh

@@ -158,9 +158,9 @@ function _p9k_worker_receive() {
     done
 
     if (( max_reset == 2 )); then
-      _p9k_refresh_reason=worker
+      _p9k__refresh_reason=worker
       _p9k_set_prompt
-      _p9k_refresh_reason=''
+      _p9k__refresh_reason=''
     fi
     (( max_reset )) && _p9k_reset_prompt
     return 0