[project] Lose the battle between tabs & spaces

I'm a tabs guy. I like tabs, it's an elegant way to represent
indentation instead of brute-forcing it. But I have to admit that the
world seems to be going towards spaces, and tooling tends not to play
nice with tabs. So here we go, changing the whole repo to spaces since
I'm getting tired of all the inconsistent formatting.

src/kernel/interrupts.h

@@ -17,7 +17,7 @@ enum class isr : uint8_t
 #undef NISR
 #undef ISR
 
-	_zero = 0
+    _zero = 0
 };
 
 /// Helper operator to add an offset to an isr vector
@@ -26,11 +26,11 @@ constexpr isr operator+(const isr &lhs, int rhs) {
 }
 
 extern "C" {
-	/// Set the CPU interrupt enable flag (sti)
-	void interrupts_enable();
+    /// Set the CPU interrupt enable flag (sti)
+    void interrupts_enable();
 
-	/// Set the CPU interrupt disable flag (cli)
-	void interrupts_disable();
+    /// Set the CPU interrupt disable flag (cli)
+    void interrupts_disable();
 }
 
 /// Disable the legacy PIC