Refactored/ streamlined UserSession code

Makes it easier to tell when a user is signed in

dev_mvc/model/actions/model_destroy.php

@@ -1,3 +1,4 @@
 <?php
 session_destroy();
+session_start();
 ?>

dev_mvc/model/actions/model_signout.php

@@ -1,7 +1,4 @@
 <?php
-include_once("./controller/UserSession.php");
-if(UserSession::isSessionValid()){
-    Database::invalidateSession(UserSession::getSession()->token);
-}
+Database::invalidateSession($_COOKIE['usersession']);
 session_destroy();
 ?>

dev_mvc/model/model_attempt_logout.php

@@ -1,7 +0,0 @@
-<?php
-include_once("./controller/UserSession.php");
-if(UserSession::isSessionValid()){
-    Database::invalidateSession(UserSession::getSession()->token);
-    session_destroy();
-}
-?>

dev_mvc/model/model_do_login.php

@@ -3,7 +3,7 @@ $debuginfo = false;
 include_once("./controller/UserSession.php");
 include_once("./controller/Database.php");
 include_once("./controller/HUtils.php");
-if(!UserSession::isSessionValid()){
+if(!UserSession::isUserSignedIn()){
     if(HUtils::issetPost(['email','password'])){
         if(Database::isLoginValid($_POST['email'], $_POST['password'])){
             //obtain UID
@@ -17,7 +17,7 @@ if(!UserSession::isSessionValid()){
                 while(Database::isSessionTokenInUse($token)){
                     $token = UserSession::generateToken();
                 }
-                $a = new UserSession($username, $uid, $token);
+                $a = new UserSession($uid, $token);
                 if($debuginfo){
                     echo $a->getSessionToken();
                     echo "<br>";