add num_derive's FromPrimitive derive to keyboard and mouse button enums

this has very limited use, outside of some tests i am writing right now,
but maybe it will be useful down the road.

(i suppose mostly, i just wanted to try this out for myself ...)

ggdt/Cargo.toml

@@ -10,7 +10,9 @@ byte-slice-cast = "1.2.1"
 byteorder = "1.4.3"
 thiserror = "=1.0.30"
 rand = "0.8.5"
-num-traits = "0.2.14"
+num = "0.4.0"
+num-derive = "0.3.3"
+num-traits = "0.2.15"
 bitflags = "2.0.2"
 flate2 = "1.0.25"
 crc32fast = "1.3.2"

ggdt/src/system/input_devices/keyboard/codes.rs

@@ -1,6 +1,8 @@
+use num_derive::FromPrimitive;
+
 // ugh
 
-#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
+#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash, FromPrimitive)]
 #[repr(i32)]
 pub enum Keycode {
 	Backspace = sdl2::keyboard::Keycode::Backspace as i32,

ggdt/src/system/input_devices/keyboard/scancodes.rs

@@ -1,6 +1,8 @@
+use num_derive::FromPrimitive;
+
 // ugh
 
-#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
+#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash, FromPrimitive)]
 #[repr(i32)]
 pub enum Scancode {
 	A = sdl2::keyboard::Scancode::A as i32,

ggdt/src/system/input_devices/mouse/buttons.rs

@@ -1,4 +1,5 @@
 use bitflags::bitflags;
+use num_derive::FromPrimitive;
 
 // equivalent to SDL's "SDL_BUTTON" macro
 #[inline]
@@ -18,7 +19,7 @@ bitflags! {
 	}
 }
 
-#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
+#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash, FromPrimitive)]
 #[repr(u8)]
 pub enum MouseButton {
 	Unknown = 0,