Former Portland developer Michael A. Liberty is in legal trouble again, this time charged with four others with tricking investors into putting about $50 million into a technology startup and then using the money to pay for what federal regulators call a “lavish lifestyle.” Liberty, his wife, his Portland lawyer, a cousin, the cousin’s friend and four shell companies were all charged in a 66-page complaint filed by the Securities and Exchange Commission in federal court in Maine. It alleges that Liberty and his associates “engaged in a long-running fraudulent scheme using multiple fraudulent securities offerings” to entice investors to put money into what they thought were shares of Mozido, a Texas-based company that Liberty founded to provide financial services to people via their mobile phones.