[WIP]RainTPL: upgrade to 3.1.0, install through Composer

Relates to shaarli#613

Modifications:
- update `Rain\Tpl` initialization code:
  - autoload with Composer
  - update configuration
  - set 'auto_escape' to false
- [template] reference static resources relatively to the index page
- [template] linklist: move "link updated date" processing to PHP code

RainTPL 3.1 specificities:
- no complex variable processing in templates:
    - `{$var1=$var2}` works
    - `{$var1=$condition ? 'Value1' : 'Value2'}` does not
- static resources are now referenced relatively to the index page,
  not to the template file, e.g. '../inc/script.js' becomes 'inc/script.js'

WIP:
- check PHP compatibility
- check all pages work properly

Signed-off-by: VirtualTam <virtualtam@flibidi.net>

CHANGELOG.md

@@ -13,6 +13,11 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 - REST API: see [Shaarli API documentation](http://shaarli.github.io/api-documentation/)
 - The theme can now be selected in the administration page.
+- Upgrade [RainTPL](https://github.com/feulf/raintpl3) to 3.1, install via Composer
+- Update HTML templates to work with RainTPL 3.1
+
+### Removed
+- Remove `inc/rain.tpl.class.php`
 
 ### Changed
 

application/PageBuilder.php

@@ -1,4 +1,6 @@
 <?php
+use Rain\Tpl;
+
 
 /**
  * This class is in charge of building the final page.
@@ -36,7 +38,7 @@ public function __construct(&$conf)
      */
     private function initialize()
     {
-        $this->tpl = new RainTPL();
+        $this->tpl = new Tpl();
 
         try {
             $version = ApplicationUtils::checkUpdate(

application/Updater.php

@@ -1,4 +1,6 @@
 <?php
+use Rain\Tpl;
+
 
 /**
  * Class Updater.
@@ -303,8 +305,8 @@ public function updateMethodDefaultTheme()
         $this->conf->set('resource.theme', trim(str_replace($parent, '', $tplDir), '/'));
         $this->conf->write($this->isLoggedIn);
 
-        // Dependency injection gore
-        RainTPL::$tpl_dir = $tplDir;
+        // Live RainTPL configuration
+        Tpl::configure(array('tpl_dir' => $tplDir));
 
         return true;
     }

composer.json

@@ -13,6 +13,7 @@
         "php": ">=5.5",
         "shaarli/netscape-bookmark-parser": "1.*",
         "erusev/parsedown": "1.6",
+        "rain/raintpl": "3.1.0",
         "slim/slim": "^3.0",
         "pubsubhubbub/publisher": "dev-master"
     },