key_defs: Add Meh and Hyper keys

To make it easier to create custom shortcuts, that do not interfere with system
ones, an old trick is to use many modifiers. To make this easier, Ctrl+Shift+Alt
is commonly abbreviated as "Meh", while Ctrl+Shift+Alt+GUI is often called
"Hyper". To support this, we offer the `Key_Meh` and `Key_Hyper` aliases, along
with `MEH(k)` and `HYPER(k)` to go with them.

Signed-off-by: Gergely Nagy <algernon@keyboard.io>

NEWS.md

@@ -83,6 +83,10 @@ There are situations where one would like to disable sending a report after each
 
 Changing layers now triggers the `onLayerChange` event - but only if there was real change (thus, calling `Layer.on(SOME_LAYER)` multiple times in a row will only trigger one event). This event was introduced to help plugins that depend on layer state schedule their work better.
 
+### Hyper and Meh keys
+
+To make it easier to create custom shortcuts, that do not interfere with system ones, an old trick is to use many modifiers. To make this easier, `Ctrl+Shift+Alt` is commonly abbreviated as `Meh`, while `Ctrl+Shift+Alt+Gui` is often called `Hyper`. To support this, we offer the `Key_Meh` and `Key_Hyper` aliases, along with `MEH(k)` and `HYPER(k)` to go with them.
+
 ## New hardware support
 
 Kaleidoscope has been ported to the following devices:

src/kaleidoscope/key_defs_aliases.h

@@ -53,3 +53,15 @@
 #define Key_RightCurlyBracket LSHIFT(Key_RightBracket)
 
 #define Key_Pipe LSHIFT(Key_Backslash)
+
+// To make it easier to create custom shortcuts, that do not interfere with
+// system ones, an old trick is to use many modifiers. To make this easier,
+// Ctrl+Shift+Alt is commonly abbreviated as "Meh", while Ctrl+Shift+Alt+GUI is
+// often called "Hyper". To support this, we offer the `Key_Meh` and `Key_Hyper`
+// aliases, along with `MEH(k)` and `HYPER(k)` to go with them.
+
+#define Key_Meh   LCTRL(LSHIFT(Key_LeftAlt))
+#define Key_Hyper MEH(Key_LeftGui)
+
+#define MEH(k)   LCTRL(LSHIFT(LALT(k)))
+#define HYPER(k) LGUI(MEH(k))