This is the first implementation of a theme manager. It’s a rebased and
revisited version of #792.

+ Removed todo
+ linked test sound to the player joined sound

+ added sound setting page
+ added sound setting icon
+ moved sound settings from interface settings

Added master volume

+ added master volume slider.
+ volume can be changed by sliding bar or by using the spin box
+ Preview of  volume will be played when dragging and releasing bar.

Added checks for qt4

Qt4 does not have support for setting the volume without some lengthy
work around, I have disabled volume control for qt4 users and have
mentioned that "Master volume requires qt5".

Updated sfx

+ removed all old sfx
+ added new end step and tap sound
+ tap/endstep sound has a timer on it to prevent spamming
+ test sound engine will now use endstep sound

Made end step sfx softer

end step felt too harsh

Added player joined sound

+ added a sound for when a new player joins a room

Updated

Was missing a sound when a player joins

Made end step softer

Made end step even softer

updated sound again

+ moved to the left to make it easier to move from buttons to macros
+ changed buttons to + / -
+ made buttons a bit bigger

Set to false by default, let me know if you think it should be true.

As all cards are played to the left of the screen this feels more
comfortable to use as you dont need to keep looking at different areas
of the screen.

Will auto rearrange when changed during game-play.

+ Can be used for setting client size and closing the client.

Will expand on by sending client alerts to the tray.

Updated to push message notifactions to the toolbar

Preview image:

Added setting to enable/disable message popups

Added functionality

+ updated popup message and translation
+ Double clicking tray icon will now bring up the app/minimize it
+ can now be alerted of mentions
+ added setting to set if you want mentions on desktop
+ clicking mention message will take you to the main chat
+ added translations for icon menu
+ removed maximize/minimize/restore from menu, not needed.

Added disconnect

+ Disconnects any previous message slots/signals from the system icon
message bubble

+ Users can now enable/disable the mouse over card scaling.

+ live preview added
+ will now only store the color if valid

+Chat mention / username color can now be set via hex in the settings
+ Users can invert the color of the mention text black/white
+ if an invalid color is provided, the default will be used

Relocated to the chat settings tab.

- removed heap alloc

- removed heap allocation

- removed heap allocs

replaced the resize(x, y) to "pack" the widgets. It saves space and
makes the settings tighter.

~ Removed some heap allocs
~ Remaining heap allocs are needed.
~ Unrolled "one line" declarations in header
~ restructured logic in GeneralSettingsPage

Refactored Appearance Tab

- removed some heap allocs
- removed setting of zone view, its not needed here, its configurable in
real time, in game.

also, fix any invalid values loaded from config

+ Renamed "Messages" to "Chat Settings"
+ Moved the chat mentions to this tab
+ Added boarder round macro settings

When being mentioned in a post with '@username' you will now see the entry highlighted. This
helps to see when someone is talking to you. It work across the main
chat, in game and in private chat.

+ Moved Icons to the top. You can now see all options.
+ All SVGs now have a background (GO! was missing one).
+ All SVGs now have the same background (General had one of its own)

Moved the button from the paths section to be below the "Download high-quality card pictures" checkbox. Button now reads "Reset/Clear Downloaded Pictures". Removed "Path to"s from card/token database, hand/stack/table/player info background, and card back labels.

Added notification messages informing users of the success or failure of clearing downloaded images.

Added a button and the functionality to clear all downloaded images (all images within subfolders at picsPath/downloadedPics) under Settings.