use more conservative glyphs in 'compatible' and 'powerline' mode

See #265.

internal/icons.zsh

@@ -446,7 +446,7 @@ function _p9k_init_icons() {
         AWS_EB_ICON                    '\U1F331'              # 🌱
         BACKGROUND_JOBS_ICON           '\u2699'               # ⚙
         TEST_ICON                      ''
-        TODO_ICON                      '\u2611'               # ☑
+        TODO_ICON                      '\u2611'               # ☑ (portable alternatives: ▼ ∆)
         BATTERY_ICON                   '\U1F50B'              # 🔋
         DISK_ICON                      'hdd' 
         OK_ICON                        '\u2714'               # ✔

internal/wizard.zsh

@@ -1413,11 +1413,28 @@ function generate_config() {
     sub VPN_IP_VISUAL_IDENTIFIER_EXPANSION "'\${P9K_VISUAL_IDENTIFIER}'"
   fi
 
-  if [[ $POWERLEVEL9K_MODE == compatible ]]; then
-    # Many fonts don't have the gear or the lock icon.
-    sub BACKGROUND_JOBS_VISUAL_IDENTIFIER_EXPANSION "'⇶'"
+  if [[ $POWERLEVEL9K_MODE == (compatible|powerline) ]]; then
+    # Many fonts don't have the default icons.
+    [[ $POWERLEVEL9K_MODE == compatible ]] && local error='х' || local error='✘'
+    uncomment 'typeset -g POWERLEVEL9K_STATUS_ERROR_VISUAL_IDENTIFIER_EXPANSION'
+    sub STATUS_ERROR_VISUAL_IDENTIFIER_EXPANSION "'$error'"
+    uncomment 'typeset -g POWERLEVEL9K_STATUS_ERROR_SIGNAL_VISUAL_IDENTIFIER_EXPANSION'
+    sub STATUS_ERROR_SIGNAL_VISUAL_IDENTIFIER_EXPANSION "'$error'"
+    uncomment 'typeset -g POWERLEVEL9K_STATUS_ERROR_PIPE_VISUAL_IDENTIFIER_EXPANSION'
+    sub STATUS_ERROR_PIPE_VISUAL_IDENTIFIER_EXPANSION "'$error'"
     uncomment 'typeset -g POWERLEVEL9K_DIR_NOT_WRITABLE_VISUAL_IDENTIFIER_EXPANSION'
     sub DIR_NOT_WRITABLE_VISUAL_IDENTIFIER_EXPANSION "'∅'"
+    uncomment 'typeset -g POWERLEVEL9K_TERRAFORM_VISUAL_IDENTIFIER_EXPANSION'
+    sub TERRAFORM_VISUAL_IDENTIFIER_EXPANSION "'tf'"
+    uncomment 'typeset -g POWERLEVEL9K_RANGER_VISUAL_IDENTIFIER_EXPANSION'
+    sub RANGER_VISUAL_IDENTIFIER_EXPANSION "'▲'"
+    uncomment 'typeset -g POWERLEVEL9K_KUBECONTEXT_DEFAULT_VISUAL_IDENTIFIER_EXPANSION'
+    sub KUBECONTEXT_DEFAULT_VISUAL_IDENTIFIER_EXPANSION "'○'"
+    uncomment 'typeset -g POWERLEVEL9K_AZURE_VISUAL_IDENTIFIER_EXPANSION'
+    sub AZURE_VISUAL_IDENTIFIER_EXPANSION "'az'"
+    uncomment 'typeset -g POWERLEVEL9K_AWS_EB_ENV_VISUAL_IDENTIFIER_EXPANSION'
+    sub AWS_EB_ENV_VISUAL_IDENTIFIER_EXPANSION "'eb'"
+    sub BACKGROUND_JOBS_VISUAL_IDENTIFIER_EXPANSION "'≡'"
   fi
 
   if [[ $POWERLEVEL9K_MODE == (awesome-patched|awesome-fontconfig) && $cap_python == 0 ]]; then