Review json_meta_config

[stefanorosanelli]

In this PR a refactor and cleanup of json_meta_config template has been done.

• some elements inherited from BEdita3 apparently not used now have been removed (ma be reintroduced later, if needed)
• BEDITA object definition done in PHP, more readable

Elements removed:

1. unused tags

<meta name="BEDITA.currLang" content="eng" />	    
<meta name="BEDITA.currLang2" content="en" />	       
<meta name="BEdita.base" content="<?= \Cake\Routing\Router::fullBaseUrl() ?>" />

2. unused BEDITA attributes

• currLang
• currLang2
• id
• relations

[codecov]

Codecov Report

Merging #521 (6e0e56f) into master (d553579) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #521   +/-   ##
=========================================
  Coverage     91.07%   91.07%           
  Complexity      708      708           
=========================================
  Files            44       44           
  Lines          2130     2130           
=========================================
  Hits           1940     1940           
  Misses          190      190           

Impacted Files	Coverage Δ	Complexity Δ
src/Plugin.php	100.00% <100.00%> (ø)	1.00 <1.00> (ø)
src/View/AppView.php	100.00% <100.00%> (ø)	3.00 <0.00> (ø)
src/View/Helper/PermsHelper.php	100.00% <100.00%> (ø)	8.00 <8.00> (ø)

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