Alter configuration loading

Set the Symphony admin URL based on configuration

Set site mode based on configuration

Update installer

Migration file skeleton for 2.4

Update 2.4 migration to add new configuration value

Fix typo in installer

Typo in installer page

Fix fields names

Fix mistakes in index

Fix defines

Fix creation of Configuration

Add comment for explanation

unset erroneous symphony-page when empty
Added pipe (|) to transliteration
Merge pull request #1895 from DeuxHuitHuit/pipe

Added pipe (|) to transliteration
Documentation tweak to Datasource class, closes #1896
Initialise the Extension Manager on installation to prevent errors with some extensions when they are being enabled during installation. Fixes #1856
Track SBL 1.29
Release 2.3.5 RC1
Futher tweaks to ensure that the a Database is available at time of installation
Ensure that the Gateway returns an integer for the status code. RE: symphonycms/jit_image_manipulation#78
Track JIT 1.21
Release 2.3.5
Collapsible optimisation, first tests
Remove legacy and deprecated components
Remove legacy styles
Use 2.3 Duplicator API
Don't manipulate the DOM in order to lock ordering. This speeds up rendering other animations like collapsing.
Move Duplicator animations to CSS
Move Collapsible animations to CSS
Clean up section editor interactions
Simplify backend frames