Update view.php to make possible send HTTP headers
Update view.php to make possible send HTTP headers

Added function `addheader($header)` to add headers in `view::headers` array and makes possible send header before template render via `rendertemplate()` or `render()` functions. Sorry for bad English.
tonyle/tonyframework,simple-mvc-framework/framework,kowston/v2,nekomajin/framework,tonyle/tonyframework,LuckyCyborg/simple-mvc-framework,XTRO123/framework,danvers/enrollment-tool,LuckyCyborg/framework,geomorillo/framework,ennerperez/simple-mvc-framework,nova-framework/framework,volter9/framework-1,LuckyCyborg/simple-mvc-framework,lcscgit/framework,LuckyCyborg/framework,capps1994/framework,OmarElGabry/framework,geomorillo/framework,raffe90/seminario_mvc,mxloco/framework,nekomajin/framework,mxloco/framework,pacozaa/framework,ahmedyassinamr/framework,XTRO123/framework,ahmedyassinamr/framework,raffe90/seminario_mvc,LuckyCyborg/simple-mvc-framework,lcscgit/framework,it4workflow/osmpoll,enjoy2000/framework,LuckyCyborg/simple-mvc-framework,danvers/enrollment-tool,raffe90/seminario_mvc,kowston/v2,tomvlk/php-framework,geomorillo/framework,nova-framework/framework,it4workflow/osmpoll,tomvlk/php-framework,danvers/enrollment-tool,tonyle/tonyframework,capps1994/framework,simple-mvc-framework/framework,XTRO123/framework,enjoy2000/framework,pacozaa/framework,volter9/framework-1,raffe90/seminario_mvc,it4workflow/osmpoll,ennerperez/simple-mvc-framework,OmarElGabry/framework