Add core extensions: UserCSS, UserJS (#6267)

* Copy CustomCSS and CustomJS

Original: FreshRSS/Extensions@9f21984

* Rename CustomCSS -> UserCSS

* Rename CustomJS -> UserJS

* Change metadata

The name is used for the directory where the configuration
is stored and should not contain spaces.
Since the name was changed, I reset the version number and
changed to semantic versioning.

* Change data directory

Changed the location of the configuration file to
the user data directory, because it is not `static`.
That way, the user's configurations are gathered
in the user directory, which makes it easier to backup them.

* Edit documentations

Remove procedures to install the extension
because it is no longer necessary.

* Fix wrong variables in the configuration page

Remove permission error indication because the storage location
is now in the user data directory managed by the application.

* Remove the `xExtension-` prefix for core extensions

* Set version to 1.0.0 for UserCSS, UserJS

* Refactoring

* Remove unused variables

* Remove version 0.0.1 in Changelog

Version 0.0.1 will not be merged, so only version 1.0.0 will remain.

* public getFileUrl

* Revert more protected

* Use entrypoint for extension user path instead of name

* Add space to extension name

* Add `#[\Override]`

* Add explains of User CSS and User JS to docs

* Remove README of User CSS and User JS

* Add migration code for extension user path

---------

Co-authored-by: Alexandre Alapetite <alexandre@alapetite.fr>

1 files changed, 10 insertions, 4 deletions

diff --git a/docs/i18n/templates/freshrss.pot b/docs/i18n/templates/freshrss.pot
index 3cc0ca681..9cfdd6905 100644
--- a/docs/i18n/templates/freshrss.pot
+++ b/docs/i18n/templates/freshrss.pot
@@ -1630,8 +1630,11 @@ msgstr ""
 #: en/./developers/03_Backend/05_Extensions.md:58
 #, no-wrap
 msgid ""
-"class HelloWorldExtension extends Minz_Extension {\n"
-"\tpublic function init() {\n"
+"final class HelloWorldExtension extends Minz_Extension {\n"
+"\t#[\Override]\n"
+"\tpublic function init(): void {\n"
+"\t\tparent::init();\n"
+"\n"
 "\t\t// your code here\n"
 "\t}\n"
 "}\n"
@@ -1911,9 +1914,12 @@ msgstr ""
 #: en/./developers/03_Backend/05_Extensions.md:134
 #, no-wrap
 msgid ""
-"class HelloWorldExtension extends Minz_Extension\n"
+"final class HelloWorldExtension extends Minz_Extension\n"
 "{\n"
-"\tpublic function init() {\n"
+"\t#[\Override]\n"
+"\tpublic function init(): void {\n"
+"\t\tparent::init();\n"
+"\n"
 "\t\t$this->registerHook('entry_before_display', array($this, "
 "'renderEntry'));\n"
 "\t}\n"