GLPI 10.0 compatibility

- Permit installation on GLPI 10.0.x
- Use same PHP minimal version as GLPI core
- Remove deprecated usage of integer display width
- Use default GLPI charset/collation during install/update
- Force database dynamic row format
- Remove dead code and useless files
- Use default sign on primary/foreign keys

Author: cedric-anne

composer.json

@@ -1,14 +1,14 @@
 {
     "require": {
-        "php": "^7.2"
+        "php": ">=7.4"
     },
     "require-dev": {
         "glpi-project/tools": "^0.4"
     },
     "config": {
         "optimize-autoloader": true,
         "platform": {
-            "php": "7.2.0"
+            "php": "7.4.0"
         },
         "sort-packages": true
     }