[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/boot/error.h

@@ -26,8 +26,8 @@ void debug_break();
 /// \arg s  An expression evaluating to a UEFI status
 /// \arg m  The error message to use on failure
 #define try_or_raise(s, m) \
-	do { \
-		uefi::status _s = (s); \
-		if (uefi::is_error(_s)) ::boot::error::raise(_s, (m), __LINE__); \
-	} while(0)
+    do { \
+        uefi::status _s = (s); \
+        if (uefi::is_error(_s)) ::boot::error::raise(_s, (m), __LINE__); \
+    } while(0)