Update the plugins managment. Add the function 'omz-plugin' (inspired from bash-it)

plugins/available/encode64/encode64.plugin.zsh

@@ -0,0 +1,17 @@
+encode64() {
+    if [[ $# -eq 0 ]]; then
+        cat | base64
+    else
+        printf '%s' $1 | base64
+    fi
+}
+
+decode64() {
+    if [[ $# -eq 0 ]]; then
+        cat | base64 --decode
+    else
+        printf '%s' $1 | base64 --decode
+    fi
+}
+alias e64=encode64
+alias d64=decode64