Customizable ColorPicker (#2202)

* Added spinbox, refactored colorpicker

* Added add preset functionality

* Added delete preset

* Refactored code

* Fix

flameshot.example.ini

@@ -7,7 +7,7 @@
 ;; The colors are arranged counter-clockwise with the first being set to the right of the cursor
 ;; Colors are any valid hex code or W3C color name
 ;; "picker" adds a custom color picker
-;userColors=#800000, #ff0000, #ffff00, #00ff00, #008000, #00ffff, #0000ff, #ff00ff, #800080, picker
+;userColors=picker, #800000, #ff0000, #ffff00, #00ff00, #008000, #00ffff, #0000ff, #ff00ff, #800080
 ;
 ;; Image Save Path
 ;savePath=/tmp
@@ -84,6 +84,9 @@
 ;; Upload to imgur without confirmation (bool)
 ;uploadWithoutConfirmation=false
 ;
+;; Use larger color palette as the default one
+; predefinedColorPaletteLarge=false
+;
 ;; Shortcut Settings for all tools
 ;[Shortcuts]
 ;TYPE_ARROW=A