Add an optional pop-up notification when auto-turn is toggled (#496)

* Implement (most of) pop-up notification when autoturn is enabled

* Add neato fading: doesn't appear to impact performance

* formatting

* added macro and UI for notification of auto-turn

* changed notification default to true for auto-turn

* added common issue for trackers

* added warning for custom keys

* minor documentation markdown format fixes

* fix qml syntax error in atgb

* gasd

Co-authored-by: ykeara <ykeara1@gmail.com>

docs/keyboard_input_guide.md

@@ -118,6 +118,10 @@
 ### Case Sensative
 - basic characters are all LOWER case, while keys such as ENTER are all UPPER case.
 
+### Custom Keys Not Saving.
+- We only load keybinds from file on start-up, and save based on what is in memory (not in file)
+  - **ONLY** edit the settings file while Advanced Settings is **not** running.
+
 ### Focus Issues
 - we deliver the keypress to the OS, depending on your set-up and program you may have to have the window "in-focus"
 
@@ -126,4 +130,4 @@
  - alt + tab, alt + F4 = `*TAB *F4`
 
 ## Parser Spec
-(Parser Spec)[https://github.com/OpenVR-Advanced-Settings/OpenVR-AdvancedSettings/blob/master/docs/specs/Keyboard_Manager-Parser_Spec.md]
+[Parser Spec](https://github.com/OpenVR-Advanced-Settings/OpenVR-AdvancedSettings/blob/master/docs/specs/Keyboard_Manager-Parser_Spec.md)