Core - Revise server settings framework

[Kexanone]

When merged this pull request will:

• Move settings internals from ArmaReforgerScripted to ACE_SettingsSystem.
• Make settings available to clients by replicating ACE_SettingsConfig instance.
• Directly work with an array of mod settings instead compiling a map.
• Add ACE_ModSettings::Init for postprocessing settings.

Notes:

• Defining settings still works the same way as before (see Basic set-up with settings framework #3):
  1. Derive from ACE_ModSettings and add your settings as attributes there (e.g. ACE_Finger_Settings)
  2. Mod ACE_MissionHeaderSettings to add your settings to the mission header (e.g. Finger's modded ACE_MissionHeaderSettings)
  3. Override Configs/ACE/Settings.conf to add your settings to the config (e.g. Finger's Settings.conf override)
• In order to get the server config change of a particular setting replicated to clients, the setting has to be added it to the codecs of ACE_SettingsConfig via modded override (For example, see Finger - Replicate settings via config codec #453). Writing codecs manually is a bit annoying, so in future we may want to switch to an attribute "ACE_RplSetting" that can be added to a setting to get it replicated automatically, however this would require runtime reflection to be expanded, e.g. missing setter (see https://feedback.bistudio.com/T174034).
• Getting settings does not change, i.e. you should still retrieve them via ACE_SettingsHelperT